Patent US1989697A successfully refreshed from Google Patents.
US3129643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo motor
Assignee: RTX Corp
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Filing: 1962-10-22
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Granted: 1964-04-21
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Expires: 1982-10-22
Abstract
No abstract record available.
Inventors
- 👤 Robert D Porter
- 👤 Charles F Stearns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:02
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/16; F02C9/26; F02C9/32; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18088; Y10T74/1812
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
107 words
IN A SERVO SYSTEM, A CYLINDER HAVING AT LEAST ONE PORT FOR ADMITTANCE OF CONTROL FLUID, A PISTON AXIALLY MOVABLE IN RESPONSE TO THE PRESSURE OF SAID FLUID, A CONTROL VALVE CONTROLLING SAID PISTON AND HAVING FLUID CONNECTIONS COMMUNICATING WITH SAID PORT, MEANS RESPONSIVE TO A TEMPERATURE VARIATION FOR PRODUCING AN INPUT SIGNAL, A CAM PIVOTALLY MOUNTED ON SAID PISTON ADAPTED TO RECEIVE SAID SIGNAL FOR POSITIONING SAID CONTROL VALVE, A MOVABLE MEMBER, MEANS CONNECTING SAID PISTON TO SAID MEMBER FOR POSITIONING SAID MEMBER IN ACCORDANCE WITH THE POSITION OF SAID PISTON, AND FEEDBACK MEANS CARRIED BY SAID CAM FOR VARYING THE EFFECT OF SAID CONTROL VALVE.
References Cited (Backward Citations)
GB387567A
Cited
US1001989A
Cited
US2297213A
Cited
US2643055A
Cited
US2816562A
Cited
US2867233A
Cited
US2980069A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-21 | 1967-10-21 | 1968-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-21 | 1971-10-21 | 1972-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-21 | 1975-10-21 | 1976-04-21 | $7700.00 | Window Closed / Lapsed |