US3640929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chrysotile asbestos fiber reinforced polymers of propylene
Assignee: Turner Brothers Asbestos Co Ltd
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Filing: 1968-10-10
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Granted: 1972-02-08
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Expires: 1988-10-10
Abstract
Abstract POLYPROPYLENE OR COPOLYMERS OF PROPYLENE REINFORCED WITH CHRYSOTILE ASBESTOS AND CONTAINING AN ANTIOXIDANT SYSTEM COMPRISING ONE OR MORE COMPOUNDS CONTAINING THE GROUP -N=C(-N<)2 AND A PHENOLIC COMPOUND SHOW GREATLY IMPROVED OXIDATION RESISTANCE. OXIDATION RESISTANCE MAY BE FURTHER INCREASED BY THE ADDITION OF CERTAIN SULPHUR COMPOUNDS, AND BY SUITABLE PRETREATMENT OF THE ABESTOS FIBER PRIOR TO COMPOUNDING.
Inventors
- 👤 Thomas W Darling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:57
CPC Classifications
H; H01; H01B; H01B17/00; H01B17/26; H01B17/265; C; C08; C08K; C08K5/00; C08K5/16; C08K5/29; C08K7/00; C08K7/02; C08K7/04; C08K7/10; C08K7/12; H01H; H01H1/00; H01H1/06; H01H33/00; H01H33/02; H01H33/28; H01H33/30; H01H33/32; H01H9/00; H01H9/30; H01H9/34; H01H9/44; H02; H02B; H02B13/00; H02B13/02; H02B13/035; H02B13/045; H01H1/12; H01H1/14; H01H2001/145
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |