US3629025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for sealing polyolefin containers
Assignee: Dow Chemical Co
•
Filing: 1968-10-03
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Granted: 1971-12-21
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Expires: 1988-10-03
Abstract
Abstract Process for the sealing of polyolefin containers with an epoxy resin formulation in which the containers are sulfonated prior to the application of the epoxy resin.
Inventors
- 👤 Wilhelm E Walles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:37
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B27/38; C; C08; C08J; C08J5/00; C08J5/12; C08J7/00; C08J7/12; C08J7/14; D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/20; D21H19/22; B32B2323/00; B32B2323/04; B32B2363/00; B32B2435/00; B32B2435/02; C08J2323/00; C08J2323/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
52 words
A process for sealing a polyolefin container and cover with epoxy resin which comprises sulfonating the case and cover, applying epoxy resin to the locus of the seal, assembling the cover and case, and curing the assembly for a time and temperature sufficient to develop the maximum strength of the epoxy resin.
Claim 2
Dependent Claim
28 words
The process as set forth in claim 2 wherein the case and cover are sulfonated to the extent of at least 0.005 milligram sulfonate groups per square centimeter.
Claim 3
Dependent Claim
16 words
The process as set forth in claim 2 wherein the container is a polypropylene battery case.
Claim 4
Dependent Claim
13 words
The process as set forth in claim 2 wherein the container is polyethylene.
References Cited (Backward Citations)
US2697162A
Cited
US2867592A
Cited
US2837497A
Cited
US3192091A
Cited
US3284278A
Cited
US3501553A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |