Patent US3273582A successfully refreshed from Google Patents.
US3273582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual circuit protection valve
Assignee: —
•
Filing: —
•
Granted: 1966-09-20
•
Expires: 1983-09-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:58
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/28; B60T11/32; B60T11/326; F; F04; F04B; F04B41/00; F04B41/02; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/365; G; G05; G05D; G05D16/00; G05D16/04; G05D16/06; G05D16/063; G05D16/0644; G05D16/0672; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/265; Y10T137/2663
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A FLUID PRESSURE RESPONSIVE CONTROL VALVE COMPRISING A CASING HAVING TWO PAIRS OF SPACED APART INLET AND DELIVERY CAVITIES AND PORTS, A PAIR OF AXIALLY ALIGNED PASAGES COMMUNICATING EACH INLET CAVITY WITH ITS DELIVERY CAVITY, A PAIR OF OPPOSED AXIALLY ALIGNED CHECK VALVES FOR CONTROLLING THE ONE-WAY FLOW OF FLUID THROUGH SAID PASSAGES FROM SAID INLET TO SAID DELIVERY CAVITIES, A THIRD INLET PORT IN SAID CASING, A FLUID CONDUIT IN SAID CASING CONNECTED TO SAID THIRD INLET PORT AND COMMUNICATING AT ITS OPPOSITE ENDS WITH THE RESPECTIVE DELIVERY CAVITIES, A SECOND PAIR OF OPPOSED CHECK VALVES IN SAID CONDUIT FOR CONTROLLING THE ONE-WAY FLOW OF FLUID FROM SAID CONDUIT TO THE RESPECTIVE DELIVERY CAVITIES, BORE MEANS IN SAID CASING IN AXIAL ALIGN-
Claim 2
Dependent Claim
123 words
A FLUID PRESSURE RESPONSIVE CONTROL VALVE COMPRISING A CASING HAVING TWO PAIRS OF SPACED APART INLET AND DELIVERY CAVITIES AND PORTS, A PAIR OF AXIALLY ALIGNED PASAGES COMMUNICATING EACH INLET CAVITY WITH ITS DELIVERY CAVITY, A PAIR OF OPPOSED AXIALLY ALIGNED CHECK VALVES FOR CONTROLLING THE ONE-WAY FLOW OF FLUID THROUGH SAID PASSAGES FROM SAID INLET TO SAID DELIVERY CAVITIES, A THIRD INLET PORT IN SAID CASING, A FLUID CONDUIT IN SAID CASING CONNECTED TO SAID THIRD INLET PORT AND COMMUNICATING AT ITS OPPOSITE ENDS WITH THE RESPECTIVE DELIVERY CAVITIES, A SECOND PAIR OF OPPOSED CHECK VALVES IN SAID CONDUIT FOR CONTROLLING THE ONE-WAY FLOW OF FLUID FROM SAID CONDUIT TO THE RESPECTIVE DELIVERY CAVITIES, BORE MEANS IN SAID CASING IN AXIAL ALIGN-
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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |