US2800913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic force balance relay
Assignee: SWARTWONT Co
•
Filing: 1952-09-06
•
Granted: 1957-07-30
•
Expires: 1972-09-06
Abstract
No abstract record available.
Inventors
- 👤 Charles J Swartwout
- 👤 Earl O Schweitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:34
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/44; G05B11/48; G05B11/50; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2365; Y10T137/2409
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2310298A
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US2219062A
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US2285540A
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US2336887A
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US2461026A
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US2582088A
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US2550666A
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US2517051A
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US2688253A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-29 | 1961-01-28 | 1961-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-29 | 1965-01-28 | 1965-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-29 | 1969-01-28 | 1969-07-30 | $7700.00 | Window Closed / Lapsed |