US2648696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed acid anhydrides and process for production of same
Assignee: Shell Development Co
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Filing: 1951-06-19
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Granted: 1953-08-11
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Expires: 1971-06-19
Abstract
No abstract record available.
Inventors
- 👤 Richard R Whetstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:31
CPC Classifications
A; A01; A01N; A01N57/00; A01N57/10; C; C07; C07C; C07C51/00; C07C51/54; C07C51/56; C07C53/00; C07C53/15; C07C53/16; C07C57/00; C07C57/30; C07C63/00; C07C63/04; C07C63/06; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/095; C07F9/096; C07F9/16; C07F9/165; C07F9/1654; C07F9/1656; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/26; C10L1/2633; C10L1/2641; C10M; C10M137/00; C10M137/02; C10M137/04; C10M137/10; C10M137/105; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/042; C10M2223/047; C10M2227/00; C10M2227/06; C10N; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2478377A
Cited
US2486658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |