US2453740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation of organic compounds and manufacture of phthalic anhydride
Assignee: Standard Oil Co
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Filing: 1945-02-16
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Granted: 1948-11-16
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Expires: 1965-02-16
Abstract
No abstract record available.
Inventors
- 👤 Sam B Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:56
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/1818; B01J8/1827; B01J8/005; B01J8/0055; B01J8/1836; B01J8/24; B01J8/38; B01J8/384; B01J8/388; C; C07; C07C; C07C51/00; C07C51/16; C07C51/31; C07C51/313; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00115; B01J2208/00123; B01J2219/00; B01J2219/18; B01J2219/185; B01J2219/19; B01J2219/194; B01J2219/1941; B01J2219/1943
Claims Analysis
Total Claims: 0
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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) | 1951-11-16 | 1952-05-17 | 1952-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-16 | 1956-05-17 | 1956-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-16 | 1960-05-17 | 1960-11-16 | $7700.00 | Window Closed / Lapsed |