Patent US3269985A successfully refreshed from Google Patents.
US3269985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of organic polycarbonates from a bischloroformate and water
Assignee: General Electric Co
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Filing: 1961-10-19
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Granted: 1966-08-30
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Expires: 1981-10-19
Abstract
No abstract record available.
Inventors
- 👤 Donald F Loncrini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:07
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
THE PROCESS FOR PREAPRING A LINEAR POLYCARBONATE RESIN WHICH COMPRISES REACTING TOGETHER, IN THE PRESENCE OF A TERTIARY AMINE, AND AS THE SOLE REACTIVE INGREDIENTS, WATER AND AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF BISHALOFORMATES OF DIHYDRIC ALCOHOLS AND BISHALOFORMATES OF DIHYDRIC PHENOLS, IN WHICH COMPOUND THE HALOFORMATE GROUPS ARE THE SOLE REACTIVE GROUPS.
Claim 2
Dependent Claim
57 words
THE PROCESS FOR PREAPRING A LINEAR POLYCARBONATE RESIN WHICH COMPRISES REACTING TOGETHER, IN THE PRESENCE OF A TERTIARY AMINE, AND AS THE SOLE REACTIVE INGREDIENTS, WATER AND AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF BISHALOFORMATES OF DIHYDRIC ALCOHOLS AND BISHALOFORMATES OF DIHYDRIC PHENOLS, IN WHICH COMPOUND THE HALOFORMATE GROUPS ARE THE SOLE REACTIVE GROUPS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |