US3135282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure control for water systems
Assignee: Clow Corp
•
Filing: 1961-10-20
•
Granted: 1964-06-02
•
Expires: 1981-10-20
Abstract
No abstract record available.
Inventors
- 👤 Gray John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:14
CPC Classifications
E; E03; E03B; E03B5/00; E03B5/02; F; F04; F04D; F04D15/00; F04D15/0072; F04D15/02; F04D15/0209; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2562; Y10T137/2564; Y10T137/2572; Y10T137/8593; Y10T137/85978; Y10T137/86131; Y10T137/86163; Y10T137/87265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A LIQUID FLOW SYSTEM ADAPTED TO SUPPLY LIQUID AT A CONSTANT UNIFORM DISCHARGE PRESSURE COMPRISING A PLURALITY OF PUMPS CONNECTED IN PARALLEL TO A SOURCE OF LIQUID UNDER PRESSURE AND TO A COMMON DISCHARGE PIPE, A PRESSURE REGULATING VALVE BETWEEN EACH OF SAID PUMPS AND SAID DISCHARGE PIPE, MEANS FOR SEQUENTIALLY ACTUATING SAID PUMPS IN RESPONSE TO PREDETERMINED PRESSURE DROPS IN SAID DISCHARGE PIPE AND MEANS FOR SHUTTING OFF SAID PUMPS SEQUENTIALLY IN REVERSE ORDER IN RESPONSE TO PREDETERMINED REDUCTION IN THE FLOW DEMAND IN SAID SYSTEM, SAID FIRST MENTIONED MEANS CONSTITUTING THE SOLE MEANS FOR ACTUATING SAID PUMPS, SAID SECOND MENTIONED MEANS CONSTITUTING THE SOLE MEANS FOR SHUTTING OFF SAID PUMPS UNDER NORMAL OPERATING CONDITIONS.
Claim 2
Dependent Claim
116 words
A LIQUID FLOW SYSTEM ADAPTED TO SUPPLY LIQUID AT A CONSTANT UNIFORM DISCHARGE PRESSURE COMPRISING A PLURALITY OF PUMPS CONNECTED IN PARALLEL TO A SOURCE OF LIQUID UNDER PRESSURE AND TO A COMMON DISCHARGE PIPE, A PRESSURE REGULATING VALVE BETWEEN EACH OF SAID PUMPS AND SAID DISCHARGE PIPE, MEANS FOR SEQUENTIALLY ACTUATING SAID PUMPS IN RESPONSE TO PREDETERMINED PRESSURE DROPS IN SAID DISCHARGE PIPE AND MEANS FOR SHUTTING OFF SAID PUMPS SEQUENTIALLY IN REVERSE ORDER IN RESPONSE TO PREDETERMINED REDUCTION IN THE FLOW DEMAND IN SAID SYSTEM, SAID FIRST MENTIONED MEANS CONSTITUTING THE SOLE MEANS FOR ACTUATING SAID PUMPS, SAID SECOND MENTIONED MEANS CONSTITUTING THE SOLE MEANS FOR SHUTTING OFF SAID PUMPS UNDER NORMAL OPERATING CONDITIONS.
References Cited (Backward Citations)
US1305997A
Cited
FR430701A
Cited
US1235558A
Cited
US1343735A
Cited
US1905284A
Cited
US2486256A
Cited
US2526646A
Cited
US2440981A
Cited
US2741986A
Cited
US2672820A
Cited
US2888875A
Cited
US3060858A
Cited
US2905191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |