US3307575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pilot operated vacuum and pressure relief valve
Assignee: Varec Inc
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Filing: 1964-09-23
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Granted: 1967-03-07
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Expires: 1984-09-23
Abstract
No abstract record available.
Inventors
- 👤 Dickinson Horace
- 👤 Clarence E Stallard
- 👤 Robert P Hanke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:18
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/18; F16K17/19; F16K17/196; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7766
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
IN A PRESSURE ACTIVATED VALVE STRUCTURE OF THE CHARACTER DESCRIBED, A DIAPHRAGM, A VALVE SEAT, VALVE MEANS ON SAID DIAPHRAGM AND COOPERATING WITH SAID VALVE SEAT, MEANS INCLUDING ONE SIDE OF SAID DIAPHRAGM AND DEFINING A FIRST CHAMBER, MEANS INCLUDING THE OTHER SIDE OF SAID DIAPHRAGM AND ONE SIDE OF SAID VALVE MEANS AND DEFINING A SECOND CHAMBER, MEANS INCLUDING THE OTHER SIDE OF SAID VALVE MEANS AND SAID SEAT AND DEFINING A THIRD CHAMBER, SAID FIRST CHAMBER BEING VENTED TO THE ATMOSPHERE, A PASSAGEWAY THROUGH SAID VALVE MEMBER COMMUNICATING SAID THIRD CHAMBER WITH SAID SECOND CHAMBER, SAID VALVE MEANS CARRYING A PRESSURE RESPONSIVE VALVE WHICH IS NORMALLY CLOSED AND WHICH IS AUTOMATICALLY OPENED WHEN THE PRESSURE IN SAID SECOND CHAMBER EXCEEDS THE PRESSURE IN SAID THIRD CHAMBER TO INTERCOMMUNICATE SAID SECOND AND THIRD CHAMBERS.
Claim 2
Dependent Claim
135 words
IN A PRESSURE ACTIVATED VALVE STRUCTURE OF THE CHARACTER DESCRIBED, A DIAPHRAGM, A VALVE SEAT, VALVE MEANS ON SAID DIAPHRAGM AND COOPERATING WITH SAID VALVE SEAT, MEANS INCLUDING ONE SIDE OF SAID DIAPHRAGM AND DEFINING A FIRST CHAMBER, MEANS INCLUDING THE OTHER SIDE OF SAID DIAPHRAGM AND ONE SIDE OF SAID VALVE MEANS AND DEFINING A SECOND CHAMBER, MEANS INCLUDING THE OTHER SIDE OF SAID VALVE MEANS AND SAID SEAT AND DEFINING A THIRD CHAMBER, SAID FIRST CHAMBER BEING VENTED TO THE ATMOSPHERE, A PASSAGEWAY THROUGH SAID VALVE MEMBER COMMUNICATING SAID THIRD CHAMBER WITH SAID SECOND CHAMBER, SAID VALVE MEANS CARRYING A PRESSURE RESPONSIVE VALVE WHICH IS NORMALLY CLOSED AND WHICH IS AUTOMATICALLY OPENED WHEN THE PRESSURE IN SAID SECOND CHAMBER EXCEEDS THE PRESSURE IN SAID THIRD CHAMBER TO INTERCOMMUNICATE SAID SECOND AND THIRD CHAMBERS.
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |