US2963201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Level indicating apparatus
Assignee: American Air Filter Co Inc
•
Filing: 1957-05-31
•
Granted: 1960-12-06
•
Expires: 1977-05-31
Abstract
No abstract record available.
Inventors
- 👤 Karl L Westlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:17
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/226
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2471778A
Cited
US2408221A
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US2638248A
Cited
US2475404A
Cited
US2672871A
Cited
US2714472A
Cited
US2680298A
Cited
US2754995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-06 | 1964-06-06 | 1964-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-06 | 1968-06-06 | 1968-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-06 | 1972-06-06 | 1972-12-06 | $7700.00 | Window Closed / Lapsed |