US3136741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polycarbonates
Assignee: Bayer AG
•
Filing: 1956-03-21
•
Granted: 1964-06-09
•
Expires: 1976-03-21
Abstract
No abstract record available.
Inventors
- 👤 Schnell Hermann
- 👤 Bottenbruch Ludwig
- 👤 Krimm Heinrich
- 👤 Fritz Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:34
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/16; C08G64/04; C08G64/06; C08G64/1608
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A LINEAR FILM AND FIBRE FORMING THERMOPLASTIC POLYCARBONATE RESIN CONSISTING ESSENTIALLY OF A LINEAR CARBONIC ACID ESTER OF ORGANIC DIHYDROXY COMPOUNDS, FROM 50 TO 90 MOL PERCENT OF THE ORGANIC DIHYDROXY COMPOUNDS HAVING THE FORMULA:
Claim 2
Dependent Claim
35 words
A LINEAR FILM AND FIBRE FORMING THERMOPLASTIC POLYCARBONATE RESIN CONSISTING ESSENTIALLY OF A LINEAR CARBONIC ACID ESTER OF ORGANIC DIHYDROXY COMPOUNDS, FROM 50 TO 90 MOL PERCENT OF THE ORGANIC DIHYDROXY COMPOUNDS HAVING THE FORMULA:
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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |