Patent US3765907A successfully refreshed from Google Patents.
US3765907A
Expired / Lapsed
US
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Blocking microleaks in flexible food packages
Assignee: United States Department of the Army
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Filing: 1971-07-22
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Granted: 1973-10-16
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Expires: 1991-07-22
Abstract
Abstract Microleaks in flexible packages constituting an avenue for microbiological contamination of the contents are blocked by immersion of the package in an elastomer polymer solution having a viscosity of 10 to 1000 centipoises which solution enters into the microleak and upon removal of the solvent deposits an elastomer plug which completely and effectively closes the microleak.
Inventors
- 👤 J Killoran
- 👤 F Rubinate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:12
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/12; B; B65; B65B; B65B55/00; B65B55/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
30 words
A method according to claim 1 wherein said solution is present in an amount of from 5 percent to 15 percent by weight based on the weight of the solution.
Claim 2
Dependent Claim
29 words
A method according to claim 2 wherein the solvent for said solution is a mixture of 4 parts by weight of methylethylketone and 1 part by weight of toluene.
Claim 3
Dependent Claim
17 words
A method according to claim 3 wherein the microbiologically-stable contents of said package is a food product.
Claim 4
Dependent Claim
19 words
A method according to claim 4 wherein said polymer solution contains about 11 percent by weight of said polymer.
Claim 5
Dependent Claim
17 words
A method according to claim 5 wherein the outer ply of said flexible package is polyethylene terephthalate.
Claim 6
Dependent Claim
16 words
A method according to claim 5 wherein the outer ply of said flexible package is polyiminocaproyl.
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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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |