Patent US3888231A successfully refreshed from Google Patents.
Patent US3022320A successfully refreshed from Google Patents.
US3022320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarboxydiphenyl sulfones and anhydrides thereof
Assignee: EIDP Inc
•
Filing: 1959-01-13
•
Granted: 1962-02-20
•
Expires: 1979-01-13
Abstract
No abstract record available.
Inventors
- 👤 Bennett Ovell Francis
- 👤 Melvin L Huber
- 👤 Robert A Smiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:10
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/688; C08G63/6884; C07; C07C; C07C317/00; C07C317/44; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/423
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
11 words
AS A NOVEL COMPOSITION OF MATTER, THE DIANHYDRIDE OF BIS-(3,4-DICARBOXYPHENYL) SULFONE.
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) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |