Patent US3290997A successfully refreshed from Google Patents.
US3290997A
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Low pressure pneumatic proportional control system
Assignee: PNEUMO DVNAMICS Corp
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Filing: 1964-09-24
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Granted: 1966-12-13
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Expires: 1984-09-24
Abstract
No abstract record available.
Inventors
- 👤 Elwood L Jerome
- 👤 Gene C Burns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:52
CPC Classifications
F; F15; F15B; F15B9/00; F15B9/02; F15B9/06; F15B9/07; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2322
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
IN A SYSTEM OF THE CHARACTER DESCRIBED, A CYLINDER ASSEMBLY, PISTON MEANS MOVABLE WITHIN SAID CYLINDER AND INCLUDING AN EXTERNALLY PROJECTING EXTENSION SERVING AS A FORCE OUTPUT MEMBER, CONTROL MEANS FOR VARIABLY SUPPLYING PRESSURE FLUID TO THE CYLINDER ASSEMBLY AT THE RESPECTIVE SIDES OF THE PISTON MEANS TO ACTUATE THE LATTER, ELECTRICAL WINDINGS INCLUDED IN THE CYLINDER ASSEMBLY IN RELATIVELY INSULATED RELATION, ENERGY MEANS FOR EXCITING ONE OF SAID WINDINGS, AND ANOTHER OF SAID WINDINGS BEING IN INDUCTIVELY COUPLED RELATION TO SUCH ONE WINDING AND CONNECTED IN A CIRCUIT TO PRODUCE AN ELECTRICAL SIGNAL AS A RESULT OF EXCITATION OF THE ONE WINDING, THE PISTON MEANS BEING SO CONSTRUCTED AS TO VARIABLY INFLUENCE THE COUPLING OF THE WINDINGS BY MOVEMENT OF THE PISTON MEANS WITHIN THE CYLINDER ASSEMBLY.
Claim 2
Dependent Claim
128 words
IN A SYSTEM OF THE CHARACTER DESCRIBED, A CYLINDER ASSEMBLY, PISTON MEANS MOVABLE WITHIN SAID CYLINDER AND INCLUDING AN EXTERNALLY PROJECTING EXTENSION SERVING AS A FORCE OUTPUT MEMBER, CONTROL MEANS FOR VARIABLY SUPPLYING PRESSURE FLUID TO THE CYLINDER ASSEMBLY AT THE RESPECTIVE SIDES OF THE PISTON MEANS TO ACTUATE THE LATTER, ELECTRICAL WINDINGS INCLUDED IN THE CYLINDER ASSEMBLY IN RELATIVELY INSULATED RELATION, ENERGY MEANS FOR EXCITING ONE OF SAID WINDINGS, AND ANOTHER OF SAID WINDINGS BEING IN INDUCTIVELY COUPLED RELATION TO SUCH ONE WINDING AND CONNECTED IN A CIRCUIT TO PRODUCE AN ELECTRICAL SIGNAL AS A RESULT OF EXCITATION OF THE ONE WINDING, THE PISTON MEANS BEING SO CONSTRUCTED AS TO VARIABLY INFLUENCE THE COUPLING OF THE WINDINGS BY MOVEMENT OF THE PISTON MEANS WITHIN THE CYLINDER ASSEMBLY.
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) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |