Patent CH245322A successfully refreshed from Google Patents.
Patent US3230412A successfully refreshed from Google Patents.
US3230412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo feed apparatus for electrical discharge machining
Assignee: Elox Corporation of Michigan
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Filing: 1962-11-02
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Granted: 1966-01-18
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Expires: 1982-11-02
Abstract
No abstract record available.
Inventors
- 👤 Robert S Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:38
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/14; B23H7/18; Y; Y10; Y10S; Y10S60/00; Y10S60/907
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
95 words
A FLUID ACTUATOR SYSTEM COMPRISING A CYLINDER, A PISTON DIFFERENTIALLY POSITIONABLE IN SAID CYLINDER, A SOURCE OF CONSTANT PRESSURE FLUID, A DIRECTIONAL CONTROL VALVE OPERATIVELY CONNECTED TO SAID PISTON THROUGH A FIRST AND SECOND CONDUIT FOR SELECTIVELY CONTROLLING ITS POSITIONING, A THIRD CONDUIT CONNECTING SAID SOURCE TO ONE FACE OF SAID PISTON, A FOURTH CONDUIT CONNECTING SAID SOURCE TO THE OTHER FACE OF SAID PISTON, AND A FLOW CONTROL VALVE CONNECTED INAT LEAST ONE OF SAID THIRD AND FOURTH CONDUITS FOR PRESETTING THE FLUID FLOW THERETHROUGH FOR MAINTAING SAID PISTON STATIONARY AT A NULL POINT.
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) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |