Patent US3148172A successfully refreshed from Google Patents.
US3148172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarbonates of dihydroxyaryl ethers
Assignee: General Electric Co
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Filing: 1956-07-19
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Granted: 1964-09-08
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Expires: 1976-07-19
Abstract
No abstract record available.
Inventors
- 👤 Daniel W Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:01
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; Y; Y10; Y10S; Y10S273/00; Y10S273/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A HIGH MOLECULAR WEIGHT, POLYMERIC CARBONATE RESIN CONSISTING ESSENTIALLY OF INTRALINEAR ALTERNATING CARBONATE GROUPS AND ETHER-CONTAINING AROMATIC GROUPS BONDED TO EACH OTHER; EACH ETHER CONTAINING AROMATIC GROUP HAVING AT LEAST TWO AROMATIC CARBOCYCLIC RADICALS BONDED TO EACH OTHER BY MEANS OF AN ETHER LINKAGE; EACH CARBONATE GROUP BEING BONDED DIRECTLY TO A NUCLEAR CARBON OF ONE AROMATIC RADICAL OF EACH ETHER CONTAINING AROMATIC GROUP.
Claim 2
Dependent Claim
64 words
A HIGH MOLECULAR WEIGHT, POLYMERIC CARBONATE RESIN CONSISTING ESSENTIALLY OF INTRALINEAR ALTERNATING CARBONATE GROUPS AND ETHER-CONTAINING AROMATIC GROUPS BONDED TO EACH OTHER; EACH ETHER CONTAINING AROMATIC GROUP HAVING AT LEAST TWO AROMATIC CARBOCYCLIC RADICALS BONDED TO EACH OTHER BY MEANS OF AN ETHER LINKAGE; EACH CARBONATE GROUP BEING BONDED DIRECTLY TO A NUCLEAR CARBON OF ONE AROMATIC RADICAL OF EACH ETHER CONTAINING AROMATIC GROUP.
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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) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |