US3627710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isocyanate-modified neoprene foam process
Assignee: EIDP Inc
•
Filing: 1969-06-19
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Granted: 1971-12-14
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Expires: 1989-06-19
Abstract
Abstract In the process of making polyisocyanate-modified neoprene foams it is necessary to lower the pH of the latex to within the 9.510.8 range prior to the polyisocyanate addition. This is conveniently accomplished by adding to the latex a strong acid salt of morpholine, diethanolamine, di-(2-propanol)amine, or ethanol(2-propanol)amine. Foams produced from such a latex have excellent resilience and load-bearing capacity.
Inventors
- 👤 James Walter Crary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:39
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/69; C08G18/696
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
12 words
The process of claim 1, where the amine salt is diethanolammonium chloride.
Claim 2
Dependent Claim
12 words
The process of claim 1, where the amine salt is diethanolammonium sulfate.
Claim 3
Dependent Claim
12 words
The process of claim 1, where the amine salt is diethanolammonium nitrate.
References Cited (Backward Citations)
US3450649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |