US3649136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low differential pressure gas flow system
Assignee: Texaco Inc
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Filing: 1969-12-30
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Granted: 1972-03-14
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Expires: 1989-12-30
Abstract
Abstract A low differential pressure, gas flow system particularly for laboratory uses. It has a cylinder and piston connected at the ends of the cylinder to give double acting pumping of a gas for circulation to and from a reactor at accurate and surge-free rates. The piston is driven by a power cylinder and piston and there are valves actuated in synchronism with the power strokes to switch the end connections of the cylinder for the gas pumping action, without pressure surges.
Inventors
- 👤 Louis E Ruidisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:01
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/0289
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
189 words
In a laboratory process having a reactor and wherein an effluent gas is recycled back to said reactor, a low differential gas flow system comprising in combination a work cylinder and piston for moving said gas, gas flow lines connected from the ends of said cylinder to the input and the output from said reactor comprising alternate connections from each said cylinder ends to said reactor input and to said reactor output respectively, externally actuated three-way valve means for switching the flow line connections from said cylinder ends between said input and output, and means for reciprocating said work piston at a predetermined rate, said last named means comprising a power cylinder and piston, means for supplying a power fluid under pressure to said power cylinder for actuating said power piston, means for connecting said power piston to said work piston, power fluid flow lines connected from said power fluid supply means to the ends of said power cylinder, second valve means for switching said power fluid flow lines between the ends of said power cylinder, and means for synchronizing actuation of said externally actuated and second valve means.
Claim 2
Dependent Claim
189 words
In a laboratory process having a reactor and wherein an effluent gas is recycled back to said reactor, a low differential gas flow system comprising in combination a work cylinder and piston for moving said gas, gas flow lines connected from the ends of said cylinder to the input and the output from said reactor comprising alternate connections from each said cylinder ends to said reactor input and to said reactor output respectively, externally actuated three-way valve means for switching the flow line connections from said cylinder ends between said input and output, and means for reciprocating said work piston at a predetermined rate, said last named means comprising a power cylinder and piston, means for supplying a power fluid under pressure to said power cylinder for actuating said power piston, means for connecting said power piston to said work piston, power fluid flow lines connected from said power fluid supply means to the ends of said power cylinder, second valve means for switching said power fluid flow lines between the ends of said power cylinder, and means for synchronizing actuation of said externally actuated and second valve means.
Claim 3
Dependent Claim
18 words
The invention according to claim 1 wherein said externally actuated valve means comprises a pair of three-way valves.
Claim 4
Dependent Claim
26 words
The invention according to claim 2 wherein said three-way valve means are biased to one position when deenergized and actuated to the other position when energized.
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |