Patent US1453923A successfully refreshed from Google Patents.
US3043800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High molecular weight linear alkalisoluble polycarbonates and process for their manufacture
Assignee: Bayer AG
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Filing: 1957-05-28
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Granted: 1962-07-10
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Expires: 1977-05-28
Abstract
No abstract record available.
Inventors
- 👤 Schnell Hermann
- 👤 Bottenbruch Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:53
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A HIGH MOLECULAR WEIGHT LINEAR FILM-FORMING POLYCARBONATE WHICH IS SOLUBLE IN AQUEOUS ALKALI AND WHICH CONSISTS ESSENTIALLY OF RECURRING UNITS HAVING ONE OF THE FORMULAE:
Claim 2
Dependent Claim
25 words
A HIGH MOLECULAR WEIGHT LINEAR FILM-FORMING POLYCARBONATE WHICH IS SOLUBLE IN AQUEOUS ALKALI AND WHICH CONSISTS ESSENTIALLY OF RECURRING UNITS HAVING ONE OF THE FORMULAE:
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) | 1965-07-09 | 1966-01-08 | 1966-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-09 | 1970-01-08 | 1970-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-09 | 1974-01-08 | 1974-07-10 | $7700.00 | Window Closed / Lapsed |