US2780231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic tank switching device
Assignee: Individual
•
Filing: 1954-11-26
•
Granted: 1957-02-05
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Expires: 1974-11-26
Abstract
No abstract record available.
Inventors
- 👤 Earnest E Westmoreland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:36
CPC Classifications
B; B67; B67D; B67D7/00; B67D7/06; B67D7/36; B67D7/78; F; F16; F16K; F16K21/00; F16K21/04; F16K21/18; F16K21/185; G; G05; G05D; G05D9/00; G05D9/12; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/265; Y10T137/2668; Y10T137/2673
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |