US3352887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing phthalic anhydrides
Assignee: United Coke and Chemical Co
•
Filing: 1965-09-16
•
Granted: 1967-11-14
•
Expires: 1985-09-16
Abstract
No abstract record available.
Inventors
- 👤 Riley Harry Lister
- 👤 Romanski Andrej
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:49
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/02; C07D301/03; C07D301/04; C07D301/08; B; B01; B01J; B01J23/00; B01J23/16; B01J23/20; B01J23/22; B01J23/70; B01J27/00; B01J27/02; B01J27/06; B01J37/00; B01J8/00; B01J8/005; B01J8/006; B01J8/18; B01J8/1836; B01J8/1881; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00389; B01J2208/00407; B01J2208/00415
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2973371A
Cited
US3226338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |