Patent US1664786A successfully refreshed from Google Patents.
Patent US2764645A successfully refreshed from Google Patents.
US2764645A
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US
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Liquid level control
Assignee: AIR IND Co Inc
•
Filing: 1952-10-18
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Granted: 1956-09-25
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Expires: 1972-10-18
Abstract
No abstract record available.
Inventors
- 👤 Roy B Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:10
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/14; G01F23/18; G01F23/185; H; H01; H01H; H01H35/00; H01H35/24; H01H35/38; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/0898; Y10T137/8158; Y10T137/8342
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1479792A
Cited
US1856584A
Cited
US1602467A
Cited
US1807280A
Cited
US2017966A
Cited
US2529688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |