Patent US3133045A successfully refreshed from Google Patents.
US3133045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
p-n-methyl acetamidophenol as chain terminator for bisphenol polycarbonates
Assignee: Honeywell International Inc
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Filing: 1961-02-20
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Granted: 1964-05-12
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Expires: 1981-02-20
Abstract
No abstract record available.
Inventors
- 👤 Rudolph D Deanin
- 👤 Ann V Pinter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:25
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
IN A PROCESS FOR PRODUCING A POLYCARBONATE BY PHOSGENEATING A MIXTURE OF (1) A MEMBER OF THE GROUP CONSISTING OF THE BISPHENOLS HAVING THE STRUCTURE
Claim 2
Dependent Claim
25 words
IN A PROCESS FOR PRODUCING A POLYCARBONATE BY PHOSGENEATING A MIXTURE OF (1) A MEMBER OF THE GROUP CONSISTING OF THE BISPHENOLS HAVING THE STRUCTURE
References Cited (Backward Citations)
US2970131A
Cited
US2964794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-12 | 1967-11-11 | 1968-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-12 | 1971-11-11 | 1972-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-12 | 1975-11-11 | 1976-05-12 | $7700.00 | Window Closed / Lapsed |