Patent US3578621A successfully refreshed from Google Patents.
US3578621A
Expired / Lapsed
US
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Diesters exhibiting internal-external lubricating properties in structural resins
Assignee: Carlisle Chemical Works Inc
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Filing: 1968-08-27
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Granted: 1971-05-11
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Expires: 1988-08-27
Abstract
Abstract ESTRS, WHICH HAVE A FORMULA CORRESPONDING TO R-COO-R1-OOC-R AND R-OOC-R1-COO-R WHEREIN R IS AN ALKYL RADICAL HAVING 15 TO 30 STRAIGHT CHAIN CARBON ATOMS AND R1 IS AN ALKYLENE RADICAL OR ALKENYLENE RADICAL HAVING 2 TO 12 STRAIGHT CHAIN CARBON ATOMS, HAVE BEEN FOUND TO UNEXPECTEDLY ACT AS COMBINED INTERNAL AND EXTERNAL LUBRICANTS FOR STRUCTURAL RESINS.
Inventors
- 👤 Christian H Stapfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:31
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/101; C08K5/103; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4207
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |