US2260303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil addition agents
Assignee: Cities Service Oil Co
•
Filing: 1939-05-08
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Granted: 1941-10-28
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Expires: 1959-05-08
Abstract
No abstract record available.
Inventors
- 👤 Engelke Ernest Frederic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:53
CPC Classifications
C; C10; C10M; C10M137/00; C10M137/02; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/16; C07F9/165; C07F9/18; C10L; C10L10/00; C10L10/06; C10M2207/00; C10M2207/40; C10M2207/404; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/047; C10M2223/06; C10M2223/061; C10M2225/00; C10M2225/02; C10N; C10N2040/00; C10N2040/02; C10N2040/04; C10N2040/042; C10N2040/044; C10N2040/046; C10N2040/20; C10N2040/22; C10N2040/25; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-10-27 | 1945-04-28 | 1945-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-10-27 | 1949-04-28 | 1949-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-10-27 | 1953-04-28 | 1953-10-28 | $7700.00 | Window Closed / Lapsed |