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US4574975A Expired / Lapsed US ⏱️ 0.0 years remaining

Resealable container closure

Assignee: Ball Corp
•
Filing: 1984-10-04
•
Granted: 1986-03-11
•
Expires: 2004-10-04
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Abstract

Abstract A resealable closure device for use on metallic cans is disclosed. The closure device comprises a metallic end including a flanged opening therein and a molded rubber or plastic element which is molded in an "inverted umbrella" position and which is capable of being inverted upon itself to seal onto the end.

Inventors

  • 👤 Robert L. Taylor
  • 👤 Danny R. Sink
  • 👤 Daniel F. Cudzik

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 10:45
CPC Classifications
B; B65; B65D; B65D41/00; B65D41/02; B65D41/16; B65D41/18

Claims Analysis

Total Claims: 54
Claim 1
Independent Claim 314 words
A closure device for a can comprising a metallic end wall having an opening therethrough and a flexible closure element, said opening being substantially surrounded by a beaded flange means that flares outwardly relative to said opening, said beaded flange means including an exterior surface portion, said end wall including a wall portion surrounding said flange means with said wall portion extending at a selected angle relative to said exterior surface portion of said flange means, said flexible closure element having a central panel, a lever portion and a connecting portion connecting said central panel with said lever portion, said lever portion being initially positioned in a first position, when said central panel is generally horizontally disposed, as a generally upwardly directed frustoconical skirt portion and having, as viewed in vertical cross-section, a nose at its connection with said connecting portion, said metallic end wall and said closure element being constructed and arranged such that, upon positioning said closure element over said opening of said metallic end wall and moving said lever portion to a second position including, when said central panel is generally horizontally disposed, moving said lever portion to a generally downwardly directed position, said nose portion will sealingly engage at least a continuous annular part of said exterior surface portion of said flange means, said closure element being out of contact with a major portion of the inner surface of said flange means, said wall portion of said metallic end wall having a substantially frustoconical annular section extending outwardly from said flange means and said lever portion having a smooth surfaced section which intimately engages said substantially frustoconical annular section of said end wall when said lever portion is moved to said second position so as to substantially prevent ingress of dirt and the like between said lever portion in said second position and said annular section of said wall portion.
Claim 2
Dependent Claim 314 words
A closure device for a can comprising a metallic end wall having an opening therethrough and a flexible closure element, said opening being substantially surrounded by a beaded flange means that flares outwardly relative to said opening, said beaded flange means including an exterior surface portion, said end wall including a wall portion surrounding said flange means with said wall portion extending at a selected angle relative to said exterior surface portion of said flange means, said flexible closure element having a central panel, a lever portion and a connecting portion connecting said central panel with said lever portion, said lever portion being initially positioned in a first position, when said central panel is generally horizontally disposed, as a generally upwardly directed frustoconical skirt portion and having, as viewed in vertical cross-section, a nose at its connection with said connecting portion, said metallic end wall and said closure element being constructed and arranged such that, upon positioning said closure element over said opening of said metallic end wall and moving said lever portion to a second position including, when said central panel is generally horizontally disposed, moving said lever portion to a generally downwardly directed position, said nose portion will sealingly engage at least a continuous annular part of said exterior surface portion of said flange means, said closure element being out of contact with a major portion of the inner surface of said flange means, said wall portion of said metallic end wall having a substantially frustoconical annular section extending outwardly from said flange means and said lever portion having a smooth surfaced section which intimately engages said substantially frustoconical annular section of said end wall when said lever portion is moved to said second position so as to substantially prevent ingress of dirt and the like between said lever portion in said second position and said annular section of said wall portion.
Claim 3
Dependent Claim 258 words
A closure device for a can comprising a metallic end wall having an opening therethrough and a flexible closure element, said opening being substantially surrounded by a beaded flange means that flares outwardly relative to said opening, said flange means including an exterior surface portion, said end wall including a wall portion surrounding said flange means with said wall portion extending at a selected angle relative to said exterior surface portion of said flange means; said flexible closure element having a central panel, a lever portion and a connecting portion connecting said central panel with said lever portion, said lever portion being initially positioned in a first position, when said central panel is generally horizontally disposed, as a generally upwardly directed frustoconical skirt portion and having, as viewed in vertical cross-section, a nose at its connection with said connecting portion, said metallic end wall and said closure element being constructed and arranged such that, upon positioning said closure element over said opening of said metallic end wall and moving said lever portion to a second position including, when said central panel is generally horizontally disposed, moving said lever portion to a generally downwardly directed position, said nose portion will sealingly engage at least a continuous annular part of said exterior surface portion of said flange means, said closure element being out of contact with a major portion of the inner surface of said flange means, said selected angle between said wall portion and said exterior surface portion of said flange means lying within the range of about 55°-75°.
Claim 4
Dependent Claim 258 words
A closure device for a can comprising a metallic end wall having an opening therethrough and a flexible closure element, said opening being substantially surrounded by a beaded flange means that flares outwardly relative to said opening, said flange means including an exterior surface portion, said end wall including a wall portion surrounding said flange means with said wall portion extending at a selected angle relative to said exterior surface portion of said flange means; said flexible closure element having a central panel, a lever portion and a connecting portion connecting said central panel with said lever portion, said lever portion being initially positioned in a first position, when said central panel is generally horizontally disposed, as a generally upwardly directed frustoconical skirt portion and having, as viewed in vertical cross-section, a nose at its connection with said connecting portion, said metallic end wall and said closure element being constructed and arranged such that, upon positioning said closure element over said opening of said metallic end wall and moving said lever portion to a second position including, when said central panel is generally horizontally disposed, moving said lever portion to a generally downwardly directed position, said nose portion will sealingly engage at least a continuous annular part of said exterior surface portion of said flange means, said closure element being out of contact with a major portion of the inner surface of said flange means, said selected angle between said wall portion and said exterior surface portion of said flange means lying within the range of about 55°-75°.
Claim 5
Dependent Claim 283 words
A closure device for a can comprising a metallic end wall having an opening therethrough and a flexible closure element, said opening being substantially surrounded by a beaded flange means that flares outwardly relative to said opening, said flange means including an exterior surface portion, said end wall including a wall portion surrounding said flange means with said wall portion extending at a selected angle relative to said exterior surface portion of said flange means, said flexible closure element having a central panel, a lever portion and a connecting portion connecting said central panel with said lever portion, said lever portion being initially positioned in a first position, when said central panel is generally horizontally disposed, as a generally upwardly directed frustoconical skirt portion and having, as viewed in vertical cross-section, a nose at its connection with said connection portion, said metallic end wall and said closure element being constructed and arranged such that, upon positioning said closure element over said opening of said metallic end wall and moving said lever portion to a second position including, when said central panel is generally horizontally disposed, moving said lever portion to a generally downwardly directed position, said nose portion will sealingly engage at least a continuous annular part of said exterior surface portion of said flange means, said closure element being out of contact with a major portion of the inner surface of said flange means, said opening of said end wall having a neck portion of minimum diameter relative to other portions of said opening, said exterior surface portion of said flange means extending at a selected angle of between about 30° and about 40° to a plane passing through said neck portion.
Claim 6
Dependent Claim 283 words
A closure device for a can comprising a metallic end wall having an opening therethrough and a flexible closure element, said opening being substantially surrounded by a beaded flange means that flares outwardly relative to said opening, said flange means including an exterior surface portion, said end wall including a wall portion surrounding said flange means with said wall portion extending at a selected angle relative to said exterior surface portion of said flange means, said flexible closure element having a central panel, a lever portion and a connecting portion connecting said central panel with said lever portion, said lever portion being initially positioned in a first position, when said central panel is generally horizontally disposed, as a generally upwardly directed frustoconical skirt portion and having, as viewed in vertical cross-section, a nose at its connection with said connection portion, said metallic end wall and said closure element being constructed and arranged such that, upon positioning said closure element over said opening of said metallic end wall and moving said lever portion to a second position including, when said central panel is generally horizontally disposed, moving said lever portion to a generally downwardly directed position, said nose portion will sealingly engage at least a continuous annular part of said exterior surface portion of said flange means, said closure element being out of contact with a major portion of the inner surface of said flange means, said opening of said end wall having a neck portion of minimum diameter relative to other portions of said opening, said exterior surface portion of said flange means extending at a selected angle of between about 30° and about 40° to a plane passing through said neck portion.
Claim 7
Dependent Claim 307 words
A closure device for a can comprising a metallic end wall having an opening therethrough and a flexible closure element, said opening being substantially surrounded by a beaded flange means that flares outwardly relative to said opening, said flange means including an exterior surface portion, said end wall including a wall portion surrounding said flange means with said wall portion extending at a selected angle relative to said exterior surface portion of said flange means, said flexible closure element having a central panel, a lever portion and a connecting portion connecting said central panel with said lever portion, said lever portion being initially positioned in a first position, when said central panel is generally horizontally disposed, as a generally upwardly directed frustoconical skirt portion and having, as viewed in vertical cross-section, a nose at its connection with said connection portion, said metallic end wall and said closure element being constructed and arranged such that, upon positioning said closure element over said opening of said metallic end wall and moving said lever portion to a second position including, when said central panel is generally horizontally disposed, moving said lever portion to a generally downwardly directed position, said nose portion will sealingly engage at least a continuous annular part of said exterior surface portion of said flange means, said closure element being out of contact with a major portion of the inner surface of said flange means, said central panel including a substantially flat outer surface and a substantially flat inner surface with said inner and outer surfaces extending substantially parallel to one another, said inner and outer surfaces of said central panel being connected by a frustoconical wall extending substantially entirely around said central panel with said frustoconical wall sloping inwardly towards said inner surface of said central panel away from said connecting portion of said closure element.
Claim 8
Dependent Claim 307 words
A closure device for a can comprising a metallic end wall having an opening therethrough and a flexible closure element, said opening being substantially surrounded by a beaded flange means that flares outwardly relative to said opening, said flange means including an exterior surface portion, said end wall including a wall portion surrounding said flange means with said wall portion extending at a selected angle relative to said exterior surface portion of said flange means, said flexible closure element having a central panel, a lever portion and a connecting portion connecting said central panel with said lever portion, said lever portion being initially positioned in a first position, when said central panel is generally horizontally disposed, as a generally upwardly directed frustoconical skirt portion and having, as viewed in vertical cross-section, a nose at its connection with said connection portion, said metallic end wall and said closure element being constructed and arranged such that, upon positioning said closure element over said opening of said metallic end wall and moving said lever portion to a second position including, when said central panel is generally horizontally disposed, moving said lever portion to a generally downwardly directed position, said nose portion will sealingly engage at least a continuous annular part of said exterior surface portion of said flange means, said closure element being out of contact with a major portion of the inner surface of said flange means, said central panel including a substantially flat outer surface and a substantially flat inner surface with said inner and outer surfaces extending substantially parallel to one another, said inner and outer surfaces of said central panel being connected by a frustoconical wall extending substantially entirely around said central panel with said frustoconical wall sloping inwardly towards said inner surface of said central panel away from said connecting portion of said closure element.
Claim 9
Dependent Claim 27 words
The invention as claimed in claim 4, wherein said frustoconical wall has at spaced apart intervals abutment means for engaging an inner surface of said flange means.
Claim 10
Dependent Claim 37 words
The invention as claimed in claim 1, 2, 3 or 4 wherein said flange means of said metallic end wall includes a bent over end section with the end section extending in the direction of said opening.
Claim 11
Dependent Claim 35 words
The invention as claimed in claims 1, 2, 3 or 4 wherein said lever portion has an outer periphery and at least one pull tab is connected to said outer periphery of said lever portion.
Claim 12
Dependent Claim 17 words
The invention as claimed in claim 7, wherein said pull tab has means for indicating tampering therewith.
Claim 13
Dependent Claim 14 words
The invention as claimed in claim 2, wherein said selected angle is approximately 60°.
Claim 14
Dependent Claim 14 words
The invention as claimed in claim 3 wherein said selected angle is approximately 35°.
Claim 15
Dependent Claim 20 words
The closure device of claim 1, 2, 3 or 4 wherein said metallic end is formed from an aluminum alloy.
Claim 16
Dependent Claim 19 words
The closure device of claim 1, 2, 3 or 4, wherein said flexible closure element is formed from polyvinylidene.
Claim 17
Dependent Claim 19 words
The closure device of claim 1, 2, 3 or 4, wherein said flexible closure element is formed from polyethylene.
Claim 18
Dependent Claim 21 words
The closure device of claim 1, 2, 3 or 4 wherein contacting surfaces of said metallic end includes a coating thereon.
Claim 19
Dependent Claim 14 words
The closure device of claim 14 wherein said coating comprises a wax or lacquer.
Claim 20
Dependent Claim 24 words
The closure device of claim 1, 2, 3 or 4 wherein said closure element is coated with a low gas transmission rate coating material.
Claim 21
Dependent Claim 13 words
The closure device of claim 16 wherein said coating material comprises polyvinylidene chloride.
Claim 22
Dependent Claim 14 words
The closure device of claim 16 wherein said coating material comprises ethylene vinyl alcohol.
Claim 23
Dependent Claim 21 words
The closure device of claim 1, 2, 3 or 4 wherein said end wall includes means for attachment comprising a curl.
Claim 24
Dependent Claim 29 words
The closure device of claim 1, 2, 3 or 4 wherein said end wall has means for attachment comprising a surface which may be adhesively bonded to a can.
Claim 25
Dependent Claim 17 words
The closure device of claim 1, 2, 3 or 4 wherein said flange means is inwardly beaded.
Claim 26
Dependent Claim 26 words
The closure device of claim 1, 2, 3 or 4 wherein said lever portion is of increasing thickness from said connecting portion to its outer periphery.
Claim 27
Dependent Claim 23 words
The closure device of claim 1, 2, 3 or 4 wherein said lever portion includes a thickened ring portion on its outer periphery.
Claim 28
Dependent Claim 24 words
The closure device of claim 1, 2, 3 or 4 wherein said metallic end wall is heated prior to assembly of said closure device.
Claim 29
Dependent Claim 23 words
The closure device of claim 1, 2, 3 or 4 wherein said closure element is heated prior to installation on said end wall.
Claim 30
Dependent Claim 20 words
The invention of claim 25 wherein said closure element is heated to a temperature between about 95° and 120° F.
Claim 31
Dependent Claim 311 words
A closure device for a can comprising a metallic end wall having an opening therethrough and a flexible closure element, said opening being substantially surrounded by a beaded flange means that flares outwardly relative to said opening, said beaded flange means including an exterior surface portion, said end wall including a wall portion surrounding said flange means with said wall portion extending at a selected angle relative to said exterior surface portion of said flange means, said flexible closure element having a central panel, a lever portion and a connecting portion connecting said central panel with said lever portion, said lever portion being initially positioned in a first position, when said central panel is generally horizontally disposed, as a generally upwardly directed frustoconical skirt portion and having, as viewed in vertical cross-section, a nose at its connection with said connecting portion, said metallic end wall and said closure element being constructed and arranged such that, upon positioning said closure element over said opening of said metallic end wall and moving said lever portion to a second position including, when said central panel is generally horizontally disposed, moving said lever portion to a generally downwardly directed position, said nose portion will sealingly engage at least a continuous annular part of the said exterior surface portion of said flange means, said closure element being out of contact with a major portion of the inner surface of said flange means, said beaded flange means including a rounded portion and said closure element including a surface that is of substantially complementary configuration in size, shape and curvature to said rounded portion so that said rounded portion and said surface on said closure element are in substantially full and complete contact with each other upon initial positioning of said closure element over said opening prior to inverting said lever portion to a generally downwardly directed position.
Claim 32
Dependent Claim 311 words
A closure device for a can comprising a metallic end wall having an opening therethrough and a flexible closure element, said opening being substantially surrounded by a beaded flange means that flares outwardly relative to said opening, said beaded flange means including an exterior surface portion, said end wall including a wall portion surrounding said flange means with said wall portion extending at a selected angle relative to said exterior surface portion of said flange means, said flexible closure element having a central panel, a lever portion and a connecting portion connecting said central panel with said lever portion, said lever portion being initially positioned in a first position, when said central panel is generally horizontally disposed, as a generally upwardly directed frustoconical skirt portion and having, as viewed in vertical cross-section, a nose at its connection with said connecting portion, said metallic end wall and said closure element being constructed and arranged such that, upon positioning said closure element over said opening of said metallic end wall and moving said lever portion to a second position including, when said central panel is generally horizontally disposed, moving said lever portion to a generally downwardly directed position, said nose portion will sealingly engage at least a continuous annular part of the said exterior surface portion of said flange means, said closure element being out of contact with a major portion of the inner surface of said flange means, said beaded flange means including a rounded portion and said closure element including a surface that is of substantially complementary configuration in size, shape and curvature to said rounded portion so that said rounded portion and said surface on said closure element are in substantially full and complete contact with each other upon initial positioning of said closure element over said opening prior to inverting said lever portion to a generally downwardly directed position.
Claim 33
Dependent Claim 427 words
A closure device for a can comprising a metallic end wall having an opening therethrough and a flexible closure element, said opening being substantially surrounded by a beaded flange means that flares outwardly relative to said opening, said beaded flange means including an exterior surface portion, said end wall including a wall portion surrounding said flange means with said wall portion extending at a selected angle relative to said exterior surface portion of said flange means, said flexible closure element having a central panel, a lever portion and a connecting portion connecting said central panel with said lever portion, said lever portion being initially positioned in a first position, when said central panel is generally horizontally disposed, as a generally upwardly directed frustoconical skirt portion and having, as viewed in vertical cross-section, a nose at its connection with said connecting portion, said metallic end wall and said closure element being constructed and arranged such that, upon positioning said closure element over said opening of said metallic end wall and moving said lever portion to a second position including, when said central panel is generally horizontally disposed, moving said lever portion to a generally downwardly directed position, said nose portion will sealingly engage at least a continuous annular part of the said exterior surface portion of said flange means, said closure element being out of contact with a major portion of the inner surface of said flange means, said metallic end wall having a substantially frustoconical annular section extending outwardly from said flange means and said lever portion having a smooth surfaced section which intimately engages said substantially frustoconical annular section of said end wall when moved to said second position so as to substantially prevent ingress of dirt and the like between said lever portion in said second position and said annular section of said end wall, said opening of said end wall having a neck portion of minimum diameter relative to other portions of said opening, said exterior surface portion of said flange means extending at a selected angle of between about 30° and about 40° to a plane passing through said neck portion, said central panel including a substantially flat outer surface and a substantially flat inner surface with said inner and outer surfaces extending substantially parallel to one another, said inner and outer surfaces of said central panel being connected by a frustoconical wall extending substantially entirely around said central panel with said frustoconical wall sloping inwardly toward said inner surface of said central panel away from said connecting portion of said closure element.
Claim 34
Dependent Claim 427 words
A closure device for a can comprising a metallic end wall having an opening therethrough and a flexible closure element, said opening being substantially surrounded by a beaded flange means that flares outwardly relative to said opening, said beaded flange means including an exterior surface portion, said end wall including a wall portion surrounding said flange means with said wall portion extending at a selected angle relative to said exterior surface portion of said flange means, said flexible closure element having a central panel, a lever portion and a connecting portion connecting said central panel with said lever portion, said lever portion being initially positioned in a first position, when said central panel is generally horizontally disposed, as a generally upwardly directed frustoconical skirt portion and having, as viewed in vertical cross-section, a nose at its connection with said connecting portion, said metallic end wall and said closure element being constructed and arranged such that, upon positioning said closure element over said opening of said metallic end wall and moving said lever portion to a second position including, when said central panel is generally horizontally disposed, moving said lever portion to a generally downwardly directed position, said nose portion will sealingly engage at least a continuous annular part of the said exterior surface portion of said flange means, said closure element being out of contact with a major portion of the inner surface of said flange means, said metallic end wall having a substantially frustoconical annular section extending outwardly from said flange means and said lever portion having a smooth surfaced section which intimately engages said substantially frustoconical annular section of said end wall when moved to said second position so as to substantially prevent ingress of dirt and the like between said lever portion in said second position and said annular section of said end wall, said opening of said end wall having a neck portion of minimum diameter relative to other portions of said opening, said exterior surface portion of said flange means extending at a selected angle of between about 30° and about 40° to a plane passing through said neck portion, said central panel including a substantially flat outer surface and a substantially flat inner surface with said inner and outer surfaces extending substantially parallel to one another, said inner and outer surfaces of said central panel being connected by a frustoconical wall extending substantially entirely around said central panel with said frustoconical wall sloping inwardly toward said inner surface of said central panel away from said connecting portion of said closure element.
Claim 35
Dependent Claim 219 words
A closure device for a can, said closure device comprising a metallic end and a flexible closure element, said metallic end having an opening therein bounded by an outwardly and upwardly flaring beaded flange and having means adjacent its periphery for attachment to said can, said metallic end including an upwardly and inwardly tapering section between said means and said flange, said flexible closure element having a central panel, a lever portion and a connecting portion connecting said central panel and said lever portion, said lever portion being initially positioned as a generally upwardly directed frustoconical portion or skirt and having, as viewed in vertical cross-section, a nose at its connection with said connecting portion, said metallic end and said closure element being constructed and arranged such that upon positioning said closure element over said opening in said metallic end and inverting said lever portion to a generally downwardly directed position, said nose portion sealingly contacts the outer surface of said flange without mechanically hooking under the outer surface of said flange and said connecting portion sealingly contacts said flange in a tangential relationship defined between said central panel and said flange while said lever portion abuts against said tapering section of said metallic end, said closure element being out of contact with the inner surface of said flange.
Claim 36
Dependent Claim 219 words
A closure device for a can, said closure device comprising a metallic end and a flexible closure element, said metallic end having an opening therein bounded by an outwardly and upwardly flaring beaded flange and having means adjacent its periphery for attachment to said can, said metallic end including an upwardly and inwardly tapering section between said means and said flange, said flexible closure element having a central panel, a lever portion and a connecting portion connecting said central panel and said lever portion, said lever portion being initially positioned as a generally upwardly directed frustoconical portion or skirt and having, as viewed in vertical cross-section, a nose at its connection with said connecting portion, said metallic end and said closure element being constructed and arranged such that upon positioning said closure element over said opening in said metallic end and inverting said lever portion to a generally downwardly directed position, said nose portion sealingly contacts the outer surface of said flange without mechanically hooking under the outer surface of said flange and said connecting portion sealingly contacts said flange in a tangential relationship defined between said central panel and said flange while said lever portion abuts against said tapering section of said metallic end, said closure element being out of contact with the inner surface of said flange.
Claim 37
Dependent Claim 85 words
The closure device of claim 29 wherein the upper end of said beaded flange includes a rounded portion and said closure element includes a surface that is of substantially complementary configuration in size, shape and curvature to said rounded portion so that said rounded portion and said surface on said closure element are in substantially full and complete contact with each other upon the initial positioning of said closure element over said opening prior to inverting said lever portion to a generally downwardly directed position.
Claim 38
Dependent Claim 64 words
The closure device of claim 30 wherein, when viewed in vertical cross-section, the surface of said beaded flange immediately below said rounded portion is a straight line, and the surface of said closure element immediately below said complementary portion thereof is also a straight line, whereby said inverting brings the two straight line surfaces into contact with each other without any substantial sliding therebetween.
Claim 39
Dependent Claim 18 words
The closure device of claim 29 wherein said metallic end is formed from a steel or aluminum alloy.
Claim 40
Dependent Claim 17 words
The closure device of claim 29 wherein said flexible closure element is formed from polyethylene of polypropylene.
Claim 41
Dependent Claim 22 words
The closure device of claim 29 wherein contacting surfaces of said metallic end and/or said flexible closure element includes a coating thereon.
Claim 42
Dependent Claim 14 words
The closure device of claim 34 wherein said coating comprises a wax of lacquer.
Claim 43
Dependent Claim 21 words
The closure device of claim 29 wherein said flexible closure element is coated with a low gas transmission rate coating material.
Claim 44
Dependent Claim 17 words
The closure device of claim 36 wherein said coating material comprises polyvinylidene chloride or ethylene vinyl alcohol.
Claim 45
Dependent Claim 14 words
The closure device of claim 29 wherein said means for attachment comprises a curl.
Claim 46
Dependent Claim 22 words
The closure device of claim 29 wherein said means for attachment comprises a surface which may be adhesively bonded to said can.
Claim 47
Dependent Claim 12 words
The closure device of claim 29 wherein said flange is outwardly beaded.
Claim 48
Dependent Claim 12 words
The closure device of claim 29 wherein said flange is inwardly beaded.
Claim 49
Dependent Claim 22 words
The closure device of claim 29 wherein said lever portion is of increasing thickness from said connecting portion to its outer periphery.
Claim 50
Dependent Claim 19 words
The closure device of claim 29 wherein said lever portion includes a thickened ring portion on its outer periphery.
Claim 51
Dependent Claim 19 words
The closure device of claim 29 wherein said lever portion includes at least one tab at its outer periphery.
Claim 52
Dependent Claim 18 words
The closure device of claim 29 wherein said central panel is of decreasing thickness towards its outer periphery.
Claim 53
Dependent Claim 24 words
The closure device of claim 29 wherein said metallic end and/or said flexible closure element is heated prior to assembly of said closure device.
Claim 54
Dependent Claim 29 words
The closure of claim 46 wherein said metallic end and/or said flexible closure element is heated to a temperature between about 95° and 150° F. (35° and 65.6° C.).

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1989-03-10 1989-09-09 1990-03-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1993-03-10 1993-09-09 1994-03-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1997-03-10 1997-09-09 1998-03-11 $7700.00 Window Closed / Lapsed

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