US3444141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Addition of phenol carbonate derivatives in polyester condensation
Assignee: Teijin Ltd
•
Filing: 1967-03-20
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Granted: 1969-05-13
•
Expires: 1987-03-20
Abstract
No abstract record available.
Inventors
- 👤 Takeo Shima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:30
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/02; C08G63/06; C08G63/82; C08G63/87
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL6407013A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |