US2822351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polysulfone condensation polymers and the preparation of same
Assignee: Individual
•
Filing: 1955-12-05
•
Granted: 1958-02-04
•
Expires: 1975-12-05
Abstract
No abstract record available.
Inventors
- 👤 Kreuchunas Algird
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:01
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08G75/02; C08G75/0204; C08G75/0209; C08G75/0213; C08G75/0218
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A POLYMERIC CONDENSATION PRODUCT OF EQUAL MOLE AMOUNTS OF A P,P''-DIHALODIPHENYL SULFONE OF THE FORMULA
Claim 2
Dependent Claim
15 words
A POLYMERIC CONDENSATION PRODUCT OF EQUAL MOLE AMOUNTS OF A P,P''-DIHALODIPHENYL SULFONE OF THE FORMULA
References Cited (Backward Citations)
US2347182A
Cited
US2505366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |