Patent US3553175A successfully refreshed from Google Patents.
US3553175A
Expired / Lapsed
US
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Beta lactone-polyisocyanate casting compositions
Assignee: Shell USA Inc
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Filing: 1968-12-09
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Granted: 1971-01-05
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Expires: 1988-12-09
Abstract
Abstract COMPOSITIONS ARE DISCLOSED COMPRISING (1) AN A, ADIALKYL-B-LACTIONE, (2) ONE OR MORE ORGANIC POLYISOCYANATE AND (3) AN ANIONIC INITIATOR CONTAINING (A) AN ATOM FROM THE GROUP CONSISTING OF NITROGEN, PHOSPHORUS, ARSENIC, SULFUR, SELENIUM OR TELLURIUM, AND (B) AT LEAST 2 SEPARATE BONDS BETWEEN SAID ATOM AND A CARBON ATOM OF AN ORGANIC RADICAL, WHICH COMPOSITIONS ARE CURABLE TO TOUGH HARD PRODUCTS.
Inventors
- 👤 Klaas Ruyter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:05
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C08G63/08; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4266; C08G18/4269; C08G18/4272; C08G63/78; C08G63/82; C08G63/823
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |