US3761440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pigmented polycarbonates with improved properties
Assignee: Bayer AG
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Filing: 1971-08-27
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Granted: 1973-09-25
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Expires: 1991-08-27
Abstract
Abstract PIGMENTED AROMATIC POLYCARBONATES ARE PROVIDED WHICH CONTAIN FROM ABOUT 5 TO ABOUT 100 PERCENT BY WEIGHT RELATIVE TO THE WEIGHT OF THE PIGMENT OF COPOLYMERS CONTAINING EPOXIDE GROUPS OR OF A VINYL POLYMER FREE OF EPOXIDE GROUPS.
Inventors
- 👤 G Peilstoecker
- 👤 D Margotte
- 👤 H Vernaleken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:33
CPC Classifications
C; C08; C08L; C08L63/00; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08L69/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |