US3494933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-hydroxyalkyl derivatives of diphenylsulfone tetracarboxylic acid diimides
Assignee: Pharmacia and Upjohn Co
•
Filing: 1967-05-25
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Granted: 1970-02-10
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Expires: 1987-05-25
Abstract
No abstract record available.
Inventors
- 👤 William J Farrissey Jr
- 👤 James S Rose
- 👤 Adnan A R Sayigh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:25
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/30; C08G18/38; C08G18/3855; C08G18/3863; C08G18/3865; C08G18/3872
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3022320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |