Patent US2944993A successfully refreshed from Google Patents.
US2944993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass-reinforced thermoplastic resin compositions based on synthetic linear polypyromellitimides
Assignee: EIDP Inc
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Filing: 1957-10-07
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Granted: 1960-07-12
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Expires: 1977-10-07
Abstract
No abstract record available.
Inventors
- 👤 Brebner Donald Lee
- 👤 Edwards Walter Murray
- 👤 Robinson Ivan Maxwell
- 👤 Squire Edward Noonan
- 👤 Jr Howard Warner Starkweather
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:37
CPC Classifications
C; C08; C08L; C08L79/00; C08L79/04; C08L79/08; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721; Y10T442/00; Y10T442/20; Y10T442/2926; Y10T442/2992
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A GLASS-REINFORCED THERMOPLASTIC RESIN COMPOSITION, SUBSTANTIALLY UNAFFECTED IN FORM AND STRENGTH BY BOILING WATER AND HAVING A RESIN-TO-GLASS BOND SHEAR STRENGTH OF AT LEAST 2800 LB./SQ. INCH, CONSISTING ESSENTIALLY OF REINFORCING GLASS AND SYNTHETIC LINEAR POLYPYROMELLITIMIDE OF LOW TO MODERATE CRYSTALLINITY HAVING AN INHERENT VISCOSITY AT 0.5 PERCENT CONCENTRATION AND 25*C. IN A META-CRESOL OF AT LEAST 0.4, A GLASSY-STATE TRANSITION TEMPERATURE OF AT LEAST 100*C., A CRYSTALLINE MELTING POINT NOT EXCEEDING 400*C., AND AS THE SOLE RECURRING INTEGRAL MEMBERS OF THE MAIN POLYMER CHAIN, CARBON AND NITROGEN BONDED ONLY TO SAID CARBON.
Claim 2
Dependent Claim
93 words
A GLASS-REINFORCED THERMOPLASTIC RESIN COMPOSITION, SUBSTANTIALLY UNAFFECTED IN FORM AND STRENGTH BY BOILING WATER AND HAVING A RESIN-TO-GLASS BOND SHEAR STRENGTH OF AT LEAST 2800 LB./SQ. INCH, CONSISTING ESSENTIALLY OF REINFORCING GLASS AND SYNTHETIC LINEAR POLYPYROMELLITIMIDE OF LOW TO MODERATE CRYSTALLINITY HAVING AN INHERENT VISCOSITY AT 0.5 PERCENT CONCENTRATION AND 25*C. IN A META-CRESOL OF AT LEAST 0.4, A GLASSY-STATE TRANSITION TEMPERATURE OF AT LEAST 100*C., A CRYSTALLINE MELTING POINT NOT EXCEEDING 400*C., AND AS THE SOLE RECURRING INTEGRAL MEMBERS OF THE MAIN POLYMER CHAIN, CARBON AND NITROGEN BONDED ONLY TO SAID CARBON.
References Cited (Backward Citations)
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US2359877A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |