US3834578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flowed-in polyurethane gaskets for pail and drum covers
Assignee: WR Grace and Co Conn
•
Filing: 1972-06-22
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Granted: 1974-09-10
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Expires: 1992-06-22
Abstract
Abstract Superior sealing performance can be imparted to pail and drum covers by equipping them with flowed-in gaskets made from a composition comprising a nitrile rubber, a polyurethane prepolymer and a carbon dioxide blocked polyamine curing agent.
Inventors
- 👤 D Smith
- 👤 J Gribens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:09
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3273743A
Cited
US3564602A
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US3389113A
Cited
US3427366A
Cited
US3635908A
Cited
US3687332A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |