Patent US3209782A successfully refreshed from Google Patents.
US3209782A
Expired / Lapsed
US
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Flapper valves
Assignee: BELL ACROSPACE Corp
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Filing: 1955-05-25
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Granted: 1965-10-05
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Expires: 1975-05-25
Abstract
No abstract record available.
Inventors
- 👤 Martin P Wolpin
- 👤 Jr Bert Smith
- 👤 Walter P Kistler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:55
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/042; F15B13/043; F15B13/0438; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/8659; Y10T137/86598; Y10T137/86606; Y10T137/8667; Y10T137/86694; Y10T137/8671
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
IN AN ELECTRICAL OPERATED SERVO VALVE, THE COMBINATION COMPRISING A POLARIZED ELECTRICAL FORCE MOTOR SECTION INCLUDING SPACED POLE PIECES, A RIGID ARMATURE MEMBER MOVABLY ARRANGED BETWEEN SAID POLE PIECES, A FLEXURE MEMBER MOUNTING SAID ARMATURE MEMBER AND PERMITTING PIVOTAL MOVEMENT THEREOF, AND A FLUID SECTION INCLUDING FLUID FLOW MEANS OPERATIVELY RESPONSIVE TO THE PIVOTAL MOVEMENT OF SAID ARMATURE MEMBER, SAID FLEXURE MEMBER SEALING SAID MOTOR SECTION FROM SAID FLUID SECTION.
Claim 2
Dependent Claim
70 words
IN AN ELECTRICAL OPERATED SERVO VALVE, THE COMBINATION COMPRISING A POLARIZED ELECTRICAL FORCE MOTOR SECTION INCLUDING SPACED POLE PIECES, A RIGID ARMATURE MEMBER MOVABLY ARRANGED BETWEEN SAID POLE PIECES, A FLEXURE MEMBER MOUNTING SAID ARMATURE MEMBER AND PERMITTING PIVOTAL MOVEMENT THEREOF, AND A FLUID SECTION INCLUDING FLUID FLOW MEANS OPERATIVELY RESPONSIVE TO THE PIVOTAL MOVEMENT OF SAID ARMATURE MEMBER, SAID FLEXURE MEMBER SEALING SAID MOTOR SECTION FROM SAID FLUID SECTION.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |