US2904537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polybenzoxazoles
Assignee: EIDP Inc
•
Filing: 1955-10-28
•
Granted: 1959-09-15
•
Expires: 1975-10-28
Abstract
No abstract record available.
Inventors
- 👤 Brinker Keith Clark
- 👤 Cameron Donald Dean
- 👤 Robinson Ivan Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:49
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A NORMALLY SOLID POLYBENZOXAZOLE COMPRISING RECURRING STRUCTURAL UNITS OF THE CLASS CONSISTING OF
Claim 2
Dependent Claim
13 words
A NORMALLY SOLID POLYBENZOXAZOLE COMPRISING RECURRING STRUCTURAL UNITS OF THE CLASS CONSISTING OF
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) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |