US3784432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a flexible closure
Assignee: Minigrip Inc
•
Filing: 1971-09-07
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Granted: 1974-01-08
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Expires: 1991-09-07
Abstract
Abstract A mechanism and method of attaching to a laminated plastic sheet a fastener profile wherein the preformed sheet is removed from a roll and passed through a heating chamber having controlled humidity and thereafter passing said sheet over a roll which forms a joining zone with an extruded plastic profile strip fed onto the sheet with a jet of air directed thereagainst, and the joined sheet and strip thereafter passing through a chamber where the strip is cooled and the heat in the sheet is maintained.
Inventors
- 👤 T Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:57
CPC Classifications
B; B29; B29C; B29C37/00; B29C37/0078; B29C37/0082; B29C65/00; B29C65/02; B29C65/022; B29C65/028; B29L; B29L2005/00; B31; B31B; B31B70/00; B31B70/74; B31B70/81; B31B70/813; B31B70/8131; B31B70/8132
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
The method of forming a sheet having a shaped profile strip means thereon comprising the steps of: heating a preformed sheet to a temperature sufficient to permit fusion to a plastic strip but less than the deterioration temperature of the film, extruding a plastic strip of heated plastic material having a small critical profile shape and immediately directing it against the sheet at a joining zone while the plastic is hot so that the profile strip is fused to the surface of the heated sheet.
Claim 2
Independent Claim
85 words
The method of forming a sheet having a shaped profile strip means thereon comprising the steps of: heating a preformed sheet to a temperature sufficient to permit fusion to a plastic strip but less than the deterioration temperature of the film, extruding a plastic strip of heated plastic material having a small critical profile shape and immediately directing it against the sheet at a joining zone while the plastic is hot so that the profile strip is fused to the surface of the heated sheet.
Claim 3
Dependent Claim
53 words
The method of forming a sheet having a shaped profile strip means thereon in accordance with the steps set forth in claim 1: wherein a jet of heated air is directed against the outer surface of the profile strip at the joining zone to urge the strip and sheet together at that location.
Claim 4
Dependent Claim
49 words
The method for forming a sheet having a shaped profile strip means thereon in accordance with the steps of claim 1: and including the step of passing the sheet through a zone of increased moisture prior to the joining zone to prevent excessive drying of the film from heating.
Claim 5
Dependent Claim
41 words
The method of forming a sheet having a shaped profile strip means thereon in accordance with the steps set forth in claim 1: and wherein the strip is cooled by a cooling fluid directed at said strip following the joining zone.
Claim 6
Dependent Claim
52 words
The method of forming a sheet having a shaped profile strip means thereon in accordance with the steps set forth in claim 1: and wherein the strip is cooled by a cooling fluid directed at said strip following the joining zone while heat is added to the sheet to maintain its temperature.
Claim 7
Dependent Claim
36 words
The method of forming a sheet having shaped profile strip means thereon in accordance with the steps of claim 1: wherein said preformed sheet is a laminated film formed of a plurality of layers of material.
Claim 8
Dependent Claim
50 words
The method of forming a sheet having a shaped profile strip means thereon in accordance with the steps of claim 1: wherein the profile strip and sheet are urged together by an air jet to increase the surface pressure therebetween them and for joining the profile strip to the sheet.
Claim 9
Dependent Claim
42 words
The method of forming a sheet having a shaped profile strip means thereon in accordance with the steps of claim 1: wherein the sheet is heated subsequent to said joining zone to maintain the temperature of the film after the joining zone.
Claim 10
Dependent Claim
34 words
The method of forming a sheet having shaped profile strip means thereon in accordance with claim 8: wherein the sheet is cooled after its temperature has been maintained for a predetermined period of time.
Claim 11
Dependent Claim
46 words
The method of forming a sheet having a shaped profile strip means thereon in accordance with claim 1: wherein the profile strip and the area of the sheet immediately adjacent thereto are cooled following the joining zone, and the sheet is heated to maintain its temperature.
Claim 12
Dependent Claim
37 words
The method of forming a sheet having a shaped profile strip means thereon in accordance with the steps of claim 10: wherein the sheet is subsequently cooled after its temperature has been maintained following the joining zone.
References Cited (Backward Citations)
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Cited
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Cited
US3462332A
Cited
US3532571A
Cited
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US3575762A
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |