Patent US3597394A successfully refreshed from Google Patents.
US3597394A
Expired / Lapsed
US
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Branching or crosslinking of polycarbonates
Assignee: Bayer Corp
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Filing: 1969-10-16
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Granted: 1971-08-03
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Expires: 1989-10-16
Abstract
Abstract POLYCARBONATES ARE BRANCHED OR CROSSLINKED BY THE ADDITION OF THE CYCLIC TRIMER OF PHOSPHONITRILIC CHLORIDE.
Inventors
- 👤 Herbert L Rawlings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:27
CPC Classifications
C; C08; C08G; C08G64/00
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |