US3774560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sealing container seams
Assignee: Rexam Beverage Can Co
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Filing: 1971-08-12
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Granted: 1973-11-27
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Expires: 1991-08-12
Abstract
Abstract A method of forming a tight seal of a container end to a container body characterized by applying a heat foamable seam sealing compound, such as a heat foamable plastisol, to an end, seaming the end to the body so that the foamable seam sealing compound will be within the seam and heating the seam to cause foaming of the seam sealing compound within the seam to the constraints of the seam. The improvement in a container double seam of a mechanically undeformed foamed sealing compound, such as a foamed plastisol.
Inventors
- 👤 T Hartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:43
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/38; B21D51/44; B21D51/46; B21D51/26; B21D51/30; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/1228; B29C44/1242; B65; B65D; B65D7/00; B65D7/12; B65D7/34; B65D7/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
16 words
The method of claim 1 wherein said precuring step is at a temperature of from 125*-200*F.
Claim 2
Dependent Claim
26 words
The method of claim 1 wherein said heating step comprises baking in an oven at a temperature of from 300*-450*F. For from 1 to 10 minutes.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein said precuring step is at a temperature of from 125*-200*F.
Claim 4
Dependent Claim
35 words
The method of claim 1 wherein said heat foamable plastisol composition comprises about 1 percent of a nitrogen releasing blowing agent, from 25-35 percent of dioctyl phthalate, and from 65-75 percent of a vinyl resin.
Claim 5
Dependent Claim
35 words
The method of claim 1 wherein said heat foamable plastisol composition comprises about 1 percent of a nitrogen releasing blowing agent, from 25-35 percent of dioctyl phthalate, and from 65-75 percent of a vinyl resin.
Claim 6
Independent Claim
150 words
A method of sealing a container end to a container body and simultaneously forming a protective interior can coating comprising the steps of: applying a heat foamable plastisol composition to the outer circumferential portion of one side of said container end: heating said heat foamable plastisol on said container end to a temperature which is sufficient to pre-cure said plastisol but is insufficient to cause foaming thereof; double seaming said container end to the container body wherein said plastisol coated circumferential portion contacts said container body within the seam; spraying a vinyl composition onto the inside of said can, said composition being curable at the same temperature that said heat foamable plastisol is foamable; and heating said seamed container end and body at said temperature and for a time sufficient to cause foaming of said plastisol and curing of said vinyl composition to fill all voids within said double seam.
Claim 7
Dependent Claim
35 words
The method of claim 7 wherein said heat foamable plastisol composition comprises about 1 percent of a nitrogen releasing blowing agent, from 25-35 percent of dioctyl phthalate, and from 65-75 percent of a vinyl resin.
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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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |