US2228500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making lubricating oils
Assignee: Shell Development Co
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Filing: 1940-04-27
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Granted: 1941-01-14
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Expires: 1960-04-27
Abstract
No abstract record available.
Inventors
- 👤 Roland F Bergstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:24
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2205/00; C10M2205/16; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/025; C10M2207/027; C10M2207/028; C10M2207/10; C10M2207/12; C10M2207/125; C10M2207/128; C10M2207/129; C10M2207/14; C10M2207/142; C10M2207/16; C10M2207/20; C10M2207/26; C10M2207/262; C10M2211/00; C10M2211/04; C10M2211/044; C10M2211/06; C10M2219/00; C10M2219/04; C10M2219/044; C10M2219/046; C10M2219/08; C10M2219/082; C10M2219/086; C10N; C10N2010/00; C10N2010/02; C10N2010/04; C10N2010/06; C10N2010/10; C10N2010/12; C10N2010/14; C10N2010/16; C10N2060/00; C10N2060/04
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) | 1944-01-14 | 1944-07-15 | 1945-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-01-14 | 1948-07-15 | 1949-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-01-14 | 1952-07-15 | 1953-01-14 | $7700.00 | Window Closed / Lapsed |