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US3381697A
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US
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Differential pressure controller
Assignee: Individual
•
Filing: 1965-11-17
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Granted: 1968-05-07
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Expires: 1985-11-17
Abstract
No abstract record available.
Inventors
- 👤 Jr Walker L Wellford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:40
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/185; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/7287; Y10T137/7339; Y10T137/7355
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US974991A
Cited
US2210868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |