US3496249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ash-free lubricating oil additives
Assignee: Roehm GmbH Darmstadt
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Filing: 1964-08-31
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Granted: 1970-02-17
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Expires: 1984-08-31
Abstract
No abstract record available.
Inventors
- 👤 Otto Hitzler
- 👤 Ulrich Schodel
- 👤 Heinz Jost
- 👤 Ernst Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:28
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C08; C08F; C08F8/00; C08J; C08J3/00; C08J3/24; C08J3/246; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L39/00; C08L39/04; C08L57/00; C08L77/00; C08L77/06; C10M2217/00; C10M2217/02; C10M2217/022; C10M2217/023; C10M2217/024; C10M2217/026; C10M2217/028; C10M2217/04; C10M2217/042; C10M2217/043; C10M2217/044; C10M2217/045; C10M2217/06; F; F02; F02B; F02B3/00; F02B3/06; Y; Y10; Y10S; Y10S525/00; Y10S525/94
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA637646A
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US2557808A
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US2723248A
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US2901457A
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US3256233A
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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) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |