US3136333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modulating valve control systems
Assignee: Individual
•
Filing: 1960-04-25
•
Granted: 1964-06-09
•
Expires: 1980-04-25
Abstract
No abstract record available.
Inventors
- 👤 David E Griswold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:58
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/38; F16K31/385; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7358; Y10T137/7368; Y10T137/7371; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7769
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A FLUID PRESSURE OPERABLE MAIN VALVE AND MODULATING CONTROL SYSTEM THEREFOR, COMPRISING: A PRESSURE DIFFERENTIAL OPERATED CONTROL VALVE CONNECTED WITH SAID MAIN VALVE FOR CONTROLLING THE SUPPLY AND EXHAUST OF OPERATING FLUID TO SAID MAIN VALVE; MEANS FOR APPLYING THE DISCHARGE PRESSURE OF SAID MAIN VALVE TO SAID PRESSURE DIFFERENTIAL OPERATED CONTROL VALVE; PILOT MEANS CONNECTED WITH SAID MAIN VALVE FOR APPLYING INLET PRESSURE TO SAID PRESSURE DIFFERENTIAL OPERATED CONTROL VALVE IN OPPOSITION TO THE OUTLET PRESSURE OF SAID MAIN VALVE; AND MEANS FOR ACTUATING SAID PILOT VALVE IN RESPONSE TO A GIVEN CONDITION RELATED TO THE OPERATION OF SAID MAIN VALVE FOR CONTROLLING SAID MAIN VALVE THROUGH SAID PRESSURE DIFFERENTIAL OPERATED CONTROL VALVE.
Claim 2
Dependent Claim
114 words
A FLUID PRESSURE OPERABLE MAIN VALVE AND MODULATING CONTROL SYSTEM THEREFOR, COMPRISING: A PRESSURE DIFFERENTIAL OPERATED CONTROL VALVE CONNECTED WITH SAID MAIN VALVE FOR CONTROLLING THE SUPPLY AND EXHAUST OF OPERATING FLUID TO SAID MAIN VALVE; MEANS FOR APPLYING THE DISCHARGE PRESSURE OF SAID MAIN VALVE TO SAID PRESSURE DIFFERENTIAL OPERATED CONTROL VALVE; PILOT MEANS CONNECTED WITH SAID MAIN VALVE FOR APPLYING INLET PRESSURE TO SAID PRESSURE DIFFERENTIAL OPERATED CONTROL VALVE IN OPPOSITION TO THE OUTLET PRESSURE OF SAID MAIN VALVE; AND MEANS FOR ACTUATING SAID PILOT VALVE IN RESPONSE TO A GIVEN CONDITION RELATED TO THE OPERATION OF SAID MAIN VALVE FOR CONTROLLING SAID MAIN VALVE THROUGH SAID PRESSURE DIFFERENTIAL OPERATED CONTROL VALVE.
References Cited (Backward Citations)
US2344583A
Cited
US2447408A
Cited
US2840104A
Cited
US2991796A
Cited
US2860657A
Cited
US2854994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |