Patent US2650198A successfully refreshed from Google Patents.
US2650198A
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Oil-soluble petroleum sulfonates
Assignee: Shell Development Co
•
Filing: 1951-03-14
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Granted: 1953-08-25
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Expires: 1971-03-14
Abstract
No abstract record available.
Inventors
- 👤 Kronig Walter
- 👤 Seeles Hans
- 👤 Burmeister Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:28
CPC Classifications
C; C10; C10M; C10M135/00; C10M135/08; C10M135/10; C07; C07C; C07C309/00; C07C309/01; C07C309/62; C10M2201/00; C10M2201/02; C10M2201/085; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/022; C10M2207/023; C10M2207/04; C10M2207/046; C10M2207/28; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2219/00; C10M2219/04; C10M2219/044; C10N; C10N2010/00; C10N2010/02; C10N2030/00; C10N2030/12; C10N2040/00; C10N2040/20; C10N2040/22; C10N2040/24; C10N2040/241; C10N2040/242; C10N2040/243; C10N2040/244; C10N2040/245; C10N2040/246; C10N2040/247
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |