US3138168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse acting pneumatic amplifier
Assignee: Robertshaw Controls Co
•
Filing: 1962-01-12
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Granted: 1964-06-23
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Expires: 1982-01-12
Abstract
No abstract record available.
Inventors
- 👤 John F Waller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:25
CPC Classifications
F; F15; F15C; F15C3/00; F15C3/04; Y; Y10; Y10T; Y10T137/00; Y10T137/2278
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
IN A PNEUMATIC AMPLIFIER, IN COMBINATION, A FLEXIBLE DIAPHRAGM ANCHORED AT THE PERIPHERAL AND CENTRAL PORTIONS THEREOF, AN APERTURE IN THE CENTRAL ANCHORED PORTION OF SAID DIAPHRAGM, A NOZZLE EXTENDING THROUGH SAID APERTURE, AND A FLAP VALVE MEANS INTEGRAL WITH SAID DIAPHRAGM ENCLOSING SAID NOZZLE AND NORMALLY JUXTAPOSED WITH THE MOUTH THEREOF TO PREVENT FLOW THEREFROM, SAID FLAP VALVE MEANS BEING MOUNTED ON SAID DIAPHRAGM BETWEEN SAID CENTRAL AND PERIPHERAL ANCHORED PORTIONS.
References Cited (Backward Citations)
US2073838A
Cited
US2451451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |