Patent US2422498A successfully refreshed from Google Patents.
US2422498A
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US
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Lubricant purifying apparatus and indicator
Assignee: Individual
•
Filing: 1944-04-25
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Granted: 1947-06-17
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Expires: 1964-04-25
Abstract
No abstract record available.
Inventors
- 👤 Perlman Samuel Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:58
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D27/00; B01D27/10
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) | 1950-06-16 | 1950-12-16 | 1951-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-16 | 1954-12-16 | 1955-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-16 | 1958-12-16 | 1959-06-17 | $7700.00 | Window Closed / Lapsed |