US1649095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of refining lubricating oils
Assignee: Sharples Specialty Co
•
Filing: 1921-10-18
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Granted: 1927-11-15
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Expires: 1941-10-18
Abstract
No abstract record available.
Inventors
- 👤 Oswald C Brewster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:11
CPC Classifications
B; B04; B04B; B04B11/00; B04B11/02; Y; Y10; Y10S; Y10S494/00; Y10S494/901
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) | 1930-11-14 | 1931-05-16 | 1931-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-11-14 | 1935-05-16 | 1935-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-11-14 | 1939-05-16 | 1939-11-15 | $7700.00 | Window Closed / Lapsed |