Patent US2499494A successfully refreshed from Google Patents.
US2499494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clogged filter signal device
Assignee: Greer Hydraulics Inc
•
Filing: 1944-03-04
•
Granted: 1950-03-07
•
Expires: 1964-03-04
Abstract
No abstract record available.
Inventors
- 👤 Edward M Greer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:03
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D35/143
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1411802A
Cited
US556008A
Cited
US1507193A
Cited
US1307207A
Cited
US1408221A
Cited
US757901A
Cited
US777677A
Cited
US844923A
Cited
US895426A
Cited
US1148054A
Cited
US1240664A
Cited
US1798973A
Cited
US1938711A
Cited
US2236087A
Cited
US2264024A
Cited
US2319578A
Cited
US2426411A
Cited
US2320763A
Cited
US2345213A
Cited
US2402885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |