Patent US1607561A successfully refreshed from Google Patents.
USRE27682E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of thermo- plastic polycarbonates
Assignee: —
•
Filing: 1971-09-09
•
Granted: 1973-06-19
•
Expires: 1991-09-09
Abstract
Abstract BRANCHED CHAIN HIGH MOLECULAR WEIGHT THERMOPLASTIC POLYCARBONATES CONTAINING THE RESIDUES OF MONOHYDRIC PHENOLS AND POLYHYDRIC PHENOLS HAVING MORE THAN TWO HYDROXY GROUPS IN THEMOLECULE.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:35
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |