Patent US3639301A successfully refreshed from Google Patents.
US3639301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-aged neoprene latex
Assignee: EIDP Inc
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Filing: 1968-04-30
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Granted: 1972-02-01
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Expires: 1988-04-30
Abstract
Abstract AN UMPROVED POLYCHLOROPRENE LATEX, USEFUL FOR MAKING POLYISOCYANATE-MODIFIED FOAMS, COMPRISES THE PRODUCT PRODUCED BY HEATING A FRESHLY PREPARED POLYCHLOROPRENE LATEX, HAVING A PH HIGHER THAN 11, AT A TEMPERATURE IN THE RANGE OF 60 TO 90* C. UNTIL THE PH IS LOWERED TO THE RANGE OF 9.5 TO 10. IN A PREFERRED EMBODIMENT THE HEATING IS CARRIED OUT ON A LATEX CONTAINING ABOUT 50% SOLIDS AND THE LATEX IS SUBSEQUENTLY CREAMED TO ABOUT 60% SOLIDS.
Inventors
- 👤 Mortimer A Youker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:41
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/69; C08G18/696; C08C; C08C1/00; C08C1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |