US2843567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline earth metal titanium alkoxide catalysts for preparing aromatic polycarbonates
Assignee: Eastman Kodak Co
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Filing: 1954-12-20
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Granted: 1958-07-15
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Expires: 1974-12-20
Abstract
No abstract record available.
Inventors
- 👤 Jack L R Williams
- 👤 Kenneth R Dunham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:08
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/30; C08G64/16; C08G64/1608
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
A PROCESS FOR PREPARING A HIGHLY POLYMERIC LINEAR POLYCARBONATE COMPRISING (A) SELF-CONDENSING A BIS-(CARBONATE) MONOMER SELECTED FROM THE GROUP CONSISTING OF THOSE HAVING THE FOLLOWING FORMULAS:
Claim 2
Dependent Claim
26 words
A PROCESS FOR PREPARING A HIGHLY POLYMERIC LINEAR POLYCARBONATE COMPRISING (A) SELF-CONDENSING A BIS-(CARBONATE) MONOMER SELECTED FROM THE GROUP CONSISTING OF THOSE HAVING THE FOLLOWING FORMULAS:
References Cited (Backward Citations)
US2455652A
Cited
US2720502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |