US3094508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Branched polycarbonate and process for preparing same
Assignee: Armstrong World Industries Inc
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Filing: 1959-04-16
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Granted: 1963-06-18
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Expires: 1979-04-16
Abstract
No abstract record available.
Inventors
- 👤 Butterworth Richard
- 👤 John A Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:09
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A METHOD OF PREPARING A BRANCHED POLYCARBONATE COMPRISING FORMING IN WATER A SOLUTION OF WATER-SOLUBLE SALTS SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL SALTS, AMMONIUM SALTS, AND ORGANIC AMINE SALTS OF A MIXTURE OF BIS-PHENOLS CONTAINING 90-99.5% BY WEIGHT OF BIS-(4-HYDROXYL PHENYL) ALKANE AND 0.5-10% BY WEIGHT OF A 2,4-BIS-(4-HYDROXYLPHENYL ALKYLIDENE) PHENOL HAVING THE STRUCTURE
Claim 2
Independent Claim
56 words
A METHOD OF PREPARING A BRANCHED POLYCARBONATE COMPRISING FORMING IN WATER A SOLUTION OF WATER-SOLUBLE SALTS SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL SALTS, AMMONIUM SALTS, AND ORGANIC AMINE SALTS OF A MIXTURE OF BIS-PHENOLS CONTAINING 90-99.5% BY WEIGHT OF BIS-(4-HYDROXYL PHENYL) ALKANE AND 0.5-10% BY WEIGHT OF A 2,4-BIS-(4-HYDROXYLPHENYL ALKYLIDENE) PHENOL HAVING THE STRUCTURE
References Cited (Backward Citations)
US2950266A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-17 | 1966-12-17 | 1967-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-17 | 1970-12-17 | 1971-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-17 | 1974-12-17 | 1975-06-18 | $7700.00 | Window Closed / Lapsed |