US3276465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backflow prevention device and relief valve control
Assignee: Individual
•
Filing: 1963-01-18
•
Granted: 1966-10-04
•
Expires: 1983-01-18
Abstract
No abstract record available.
Inventors
- 👤 Fred K Wyckoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:25
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/106; E03C1/108; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/2557; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2617; Y10T137/262; Y10T137/3149; Y10T137/7722; Y10T137/7837; Y10T137/7847; Y10T137/7848
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A BACKFLOW PREVENTION UNIT ADAPTED TO BE CONNECTED BETWEEN A SUPPLY MAIN AND A SERVICE PIPE, COMPRISING: A FIRST CHECK VALVE AND A SECOND CHECK VALVE, SAID CHECK VALVES BEING CONNECTED IN SERIES, SAID FIRST CHECK VALVE HAVING AN INLET ADAPTED TO BE SUBJECTED TO THE PRESSURE IN SAID SUPPLY MAIN, AND SAID SECOND CHECK VALVE HAVING AN OUTPUT ADAPTED TO BE SUBJECTED TO THE PRESSURE IN SAID SERVICE PIPE; A DIFFERENTIAL PRESSURE RESPONSIVE RELIEF VALVE COMMUNICATING WITH SAID CHECK VALVES AT A ZONE INCLUDING THE OUTLET OF THE FIRST CHECK VALVE AND THE INLET OF THE SECOND CHECK VALVE FOR EFFECTING DRAINING OF SAID ZONE; AND MEANS CONTROLLING SAID RELIEF VALVE IN ACCORDANCE WITH THE DIFFERENTIAL PRESSURE ARCOSS
Claim 2
Dependent Claim
119 words
A BACKFLOW PREVENTION UNIT ADAPTED TO BE CONNECTED BETWEEN A SUPPLY MAIN AND A SERVICE PIPE, COMPRISING: A FIRST CHECK VALVE AND A SECOND CHECK VALVE, SAID CHECK VALVES BEING CONNECTED IN SERIES, SAID FIRST CHECK VALVE HAVING AN INLET ADAPTED TO BE SUBJECTED TO THE PRESSURE IN SAID SUPPLY MAIN, AND SAID SECOND CHECK VALVE HAVING AN OUTPUT ADAPTED TO BE SUBJECTED TO THE PRESSURE IN SAID SERVICE PIPE; A DIFFERENTIAL PRESSURE RESPONSIVE RELIEF VALVE COMMUNICATING WITH SAID CHECK VALVES AT A ZONE INCLUDING THE OUTLET OF THE FIRST CHECK VALVE AND THE INLET OF THE SECOND CHECK VALVE FOR EFFECTING DRAINING OF SAID ZONE; AND MEANS CONTROLLING SAID RELIEF VALVE IN ACCORDANCE WITH THE DIFFERENTIAL PRESSURE ARCOSS
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |