US3737409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolycarbonate of bis-3,5-dimethyl-4-hydroxyphenyl)sulfone with bisphenol-a
Assignee: General Electric Co
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Filing: 1971-03-08
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Granted: 1973-06-05
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Expires: 1991-03-08
Abstract
Abstract A COPOLYMER OF THE REACTION PRODUCT OF (1) BIS-(3,5DIMETHYL-4-HYDROXYPHENYL) SULFONE, (2), 2.2-BIS-(4-HYDROXYPHENYL) PROPANE AND (3) A CARBONATE PRECURSOR WHEREIN THE REACTION MIXTURE OF (1) AND (2) ARE INITIALLY 40-99 WEIGHT PERCENT OF (1) AND CORRESPONDINGLY 60-1 WEIGHT PERCENT OF (2). IN ADDITION, THIS INVENTION IS DIRECTED TO A HIGH HEAT DISTORTION, ORIENTABLE TEXTILE FIBER OF THE COPOLYMER SET FORTH ABOVE.
Inventors
- 👤 D Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:17
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/081
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |