Patent US2494534A successfully refreshed from Google Patents.
US2494534A
Expired / Lapsed
US
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Coolant filter system
Assignee: US Hoffman Machinery Corp
•
Filing: 1944-03-16
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Granted: 1950-01-17
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Expires: 1964-03-16
Abstract
No abstract record available.
Inventors
- 👤 Francis J Armstrong
- 👤 Henry F Hamlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:17
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D35/147; B01D21/00; B01D21/0012; B01D21/0039; B01D21/24; B01D21/2433; B01D21/245; B23; B23Q; B23Q11/00; B23Q11/0042; B23Q11/0057; B23Q11/10; B23Q11/1069
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) | 1953-01-16 | 1953-07-18 | 1954-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-16 | 1957-07-18 | 1958-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-16 | 1961-07-18 | 1962-01-17 | $7700.00 | Window Closed / Lapsed |