US3545468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level controller employing vortex valve
Assignee: Bowles Engineering Corp
•
Filing: 1969-05-06
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Granted: 1970-12-08
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Expires: 1989-05-06
Abstract
No abstract record available.
Inventors
- 👤 Peter A Freeman
- 👤 Robert A Bean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:12
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/003; F15C1/16; G; G01; G01F; G01F23/00; G01F23/14; G01F23/16; G01F23/161; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2065; Y10T137/2071; Y10T137/2076; Y10T137/2087; Y10T137/2098; Y10T137/2109; Y10T137/2115
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-07 | 1974-06-08 | 1974-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-07 | 1978-06-08 | 1978-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-07 | 1982-06-08 | 1982-12-08 | $7700.00 | Window Closed / Lapsed |