US3727022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic heating and sealing
Assignee: Procter and Gamble Co
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Filing: 1972-07-17
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Granted: 1973-04-10
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Expires: 1992-07-17
Abstract
Abstract A method and apparatus for electromagnetically (i.e., induction) heating and sealing materials, as exemplified by a laminated collapsible dispensing tube body having metallic and polymeric layers therein, the metallic layer being circumferentially discontinuous (i.e., having a seam) and a thermoplastic closure therefore, is provided. The prior art difficulties resulting from the discontinuity in the metallic layer are overcome by the provision of shielding, either alone or in combination with means for focusing the electromagnetic energy.
Inventors
- 👤 P Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:30
CPC Classifications
B; B65; B65B; B65B51/00; B65B51/10; B65B51/22; B65B51/227; B29; B29C; B29C65/00; B29C65/02; B29C65/34; B29C65/36; B29C65/3604; B29C65/3656; B29C65/3668; B29C65/3672; B29C65/3676; B29C65/368; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/12; B29C66/122; B29C66/1224; B29C66/1228; B29C66/50; B29C66/51; B29C66/53; B29C66/534; B29C66/5344; B29C66/61; B29C66/612; B29C66/63; B29C66/70; B29C66/72; B29C66/723; B29C66/7232; B29C66/72321; B29C66/80; B29C66/81; B29C66/812; B29C66/8126; B29C66/81261; B29C66/83; B29C66/832; B29C66/8322; B29D; B29D23/00; B29D23/20; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0811; B29C66/71; B29C66/8122; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29L; B29L2009/00; B29L2009/003; B29L2023/00; B29L2023/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
142 words
A method of sealing an endpiece to a tubular body, said body comprising a layer of metallic material and a layer of thermoplastic material and including a longitudinal seam, said seam providing circumferential electrical discontinuity in said metallic layer, said method comprising: A. placing said body in the desired relationship with said endpiece; B. shielding the portion of said body away from said endpiece with a conductive shield, said shield closely fitting about said body at least along said seam; C. applying heat to said metallic material in the region of said endpiece by means of an induction heating apparatus having a coil encircling said region, whereby the heat induced in said metallic material will melt said thermoplastic material; and, D. discontinuing the application of said heat thereby allowing said meltable nonconducting material to solidify and bond said body to said endpiece.
Claim 2
Independent Claim
142 words
A method of sealing an endpiece to a tubular body, said body comprising a layer of metallic material and a layer of thermoplastic material and including a longitudinal seam, said seam providing circumferential electrical discontinuity in said metallic layer, said method comprising: A. placing said body in the desired relationship with said endpiece; B. shielding the portion of said body away from said endpiece with a conductive shield, said shield closely fitting about said body at least along said seam; C. applying heat to said metallic material in the region of said endpiece by means of an induction heating apparatus having a coil encircling said region, whereby the heat induced in said metallic material will melt said thermoplastic material; and, D. discontinuing the application of said heat thereby allowing said meltable nonconducting material to solidify and bond said body to said endpiece.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said induction heating apparatus operates at a frequency of from about 200 kilohertz to about 450 kilohertz.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein said shield completely encircles said body.
Claim 5
Dependent Claim
18 words
The method of claim 1 including placing a magnetic focusing means within said body and adjacent said endpiece.
Claim 6
Independent Claim
164 words
A method of sealing an endpiece to a tubular body, said body comprising a layer of metallic material and a layer of thermoplastic material and including a longitudinal seam, said seam providing circumferential electrical discontinuity in said metallic layer, said method comprising: A. placing said endpiece in the desired relationship with said body; B. shielding the portion of said body away from said endpiece with a conductive shield, said shield closely fitting about and completely encircling said body and placing a magnetic focusing means within said body and adjacent said endpiece; C. applying heat to said metallic material in the region of said endpiece by means of an induction heating apparatus operating at from about 200 kilohertz to about 450 kilohertz, said apparatus having a coil encircling said region, whereby the heat induced in said magnetic material will melt said thermoplastic material; and, D. discontinuing the application of said heat thereby allowing said thermoplastic material to solidify and bond said body to said endpiece.
Claim 7
Independent Claim
164 words
A method of sealing an endpiece to a tubular body, said body comprising a layer of metallic material and a layer of thermoplastic material and including a longitudinal seam, said seam providing circumferential electrical discontinuity in said metallic layer, said method comprising: A. placing said endpiece in the desired relationship with said body; B. shielding the portion of said body away from said endpiece with a conductive shield, said shield closely fitting about and completely encircling said body and placing a magnetic focusing means within said body and adjacent said endpiece; C. applying heat to said metallic material in the region of said endpiece by means of an induction heating apparatus operating at from about 200 kilohertz to about 450 kilohertz, said apparatus having a coil encircling said region, whereby the heat induced in said magnetic material will melt said thermoplastic material; and, D. discontinuing the application of said heat thereby allowing said thermoplastic material to solidify and bond said body to said endpiece.
Claim 8
Independent Claim
103 words
An apparatus for sealing an endpiece to a tubular body said body comprising a layer of metallic material and a layer of thermoplastic material and including a longitudinal seam, said seam providing circumferential electrical discontinuity in said metallic layer, said apparatus comprising: A. A mandrel adapted to engage said body and said endpiece and hold the desired abutting relationship therebetween; B. An induction heating means including a coil encircling the region of abuttment between said body and said endpiece; and C. A conductive shielding means disposed along said body at least in the region of said seam immediately adjacent said region of abuttment.
Claim 9
Independent Claim
103 words
An apparatus for sealing an endpiece to a tubular body said body comprising a layer of metallic material and a layer of thermoplastic material and including a longitudinal seam, said seam providing circumferential electrical discontinuity in said metallic layer, said apparatus comprising: A. A mandrel adapted to engage said body and said endpiece and hold the desired abutting relationship therebetween; B. An induction heating means including a coil encircling the region of abuttment between said body and said endpiece; and C. A conductive shielding means disposed along said body at least in the region of said seam immediately adjacent said region of abuttment.
Claim 10
Dependent Claim
22 words
The apparatus of claim 6 wherein said shielding means completely encircles said body in the region immediately adjacent said region of abuttment.
Claim 11
Dependent Claim
26 words
The apparatus of claim 6 wherein said mandrel includes a magnetic focusing means located on the interior of said tube and adjacent said region of abuttment.
Claim 12
Independent Claim
118 words
An apparatus for sealing an endpiece to a tubular body said body comprising a layer of metallic material and a layer of thermoplastic material and including a longitudinal seam, said seam providing circumferential electrical discontinuity in said metallic layer, said apparatus comprising: A. A mandrel adapted to engage said body and said endpiece and hold them in the desired abutting relationship said mandrel including a magentic focusing means located on the interior of said tube and adjacent the region of abuttment; B. An induction heating means including a coil encircling said region of abuttment between said body and said endpiece; and C. A conductive shielding means encircling said body in the region immediately adjacent said region of abuttment.
Claim 13
Independent Claim
118 words
An apparatus for sealing an endpiece to a tubular body said body comprising a layer of metallic material and a layer of thermoplastic material and including a longitudinal seam, said seam providing circumferential electrical discontinuity in said metallic layer, said apparatus comprising: A. A mandrel adapted to engage said body and said endpiece and hold them in the desired abutting relationship said mandrel including a magentic focusing means located on the interior of said tube and adjacent the region of abuttment; B. An induction heating means including a coil encircling said region of abuttment between said body and said endpiece; and C. A conductive shielding means encircling said body in the region immediately adjacent said region of abuttment.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |