US3728292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamides foamed with n-substituted carbamic ester blowing agents
Assignee: Imperial Chemical Industries Ltd
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Filing: 1971-07-16
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Granted: 1973-04-17
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Expires: 1991-07-16
Abstract
Abstract MANUFACTURE OF RIGID NYLON FOAM BY THE USE OF N-SUBSTITUTED CARBAMIC ESTERS AS BLOWING AGENTS, ESPECIALLY THE CARBAMIC ESTERS FROM BIS-ISOCYANATES AND MONOFUNCTIONAL ALCOHOLS AND THOSE FROM HETEROCYCLIC NH COMPOUNDS AND ALKYL CHLOROFORMATES.
Inventors
- 👤 E Smith
- 👤 Grath H Mc
- 👤 R Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:20
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J2377/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |