Patent US3208398A successfully refreshed from Google Patents.
US3208398A
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Fluid operated flow valve and method
Assignee: Dresser Industries Inc
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Filing: 1962-10-15
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Granted: 1965-09-28
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Expires: 1982-10-15
Abstract
No abstract record available.
Inventors
- 👤 Bob L Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:47
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/122; E21B43/123; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2934
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
IN A FLOW VALVE, A PRESSURE CHAMBER, AN UPPER SEALED BELLOWS DIAPHRAGM SUSPENDED BELOW THE PRESSURE CHAMBER AND BEING IN FLUID COMMUNICATION THEREWITH, SAID PRESSURE CHAMBER AND BELLOWS DIAPHRAGM BEING CHARGED AT A PREDETERMINED PRESSURE ABOVE ATMOSPHERIC PRESSURE; A VALVE ASSEMBLY ATTACHED BELOW THE UPPER BELOWS DIAPHRAGM INCLUDING A SEALED CHAMBER; A LOWER BELLOWS DIAPHRAGM SUSPENDED BELOW THE CHAMBER AND BEING IN COMMUNICATION THEREWITH; A VALVE HEAD ATTACHED TO THE LOWER END OF THE LOWER BELLOWS DIAPHRAGM; MEANS CARRIED BY THE VALVE HEAD EXTENDING UPWARDLY ABOUT THE LAST-NAMED CHAMBER, CONTACTING THE LOWER END O THE UPPER BELLOWS, AND BEING ARRANGED TO MOVE UPWARDLY AND DOWNWARDLY UPON THE OPENING AND CLOSING OF THE VALVE; AND A VALVE
Claim 2
Dependent Claim
116 words
IN A FLOW VALVE, A PRESSURE CHAMBER, AN UPPER SEALED BELLOWS DIAPHRAGM SUSPENDED BELOW THE PRESSURE CHAMBER AND BEING IN FLUID COMMUNICATION THEREWITH, SAID PRESSURE CHAMBER AND BELLOWS DIAPHRAGM BEING CHARGED AT A PREDETERMINED PRESSURE ABOVE ATMOSPHERIC PRESSURE; A VALVE ASSEMBLY ATTACHED BELOW THE UPPER BELOWS DIAPHRAGM INCLUDING A SEALED CHAMBER; A LOWER BELLOWS DIAPHRAGM SUSPENDED BELOW THE CHAMBER AND BEING IN COMMUNICATION THEREWITH; A VALVE HEAD ATTACHED TO THE LOWER END OF THE LOWER BELLOWS DIAPHRAGM; MEANS CARRIED BY THE VALVE HEAD EXTENDING UPWARDLY ABOUT THE LAST-NAMED CHAMBER, CONTACTING THE LOWER END O THE UPPER BELLOWS, AND BEING ARRANGED TO MOVE UPWARDLY AND DOWNWARDLY UPON THE OPENING AND CLOSING OF THE VALVE; AND A VALVE
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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |