Patent US3225299A successfully refreshed from Google Patents.
US3225299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic charge transfer tachometer
Assignee: Individual
•
Filing: 1961-05-16
•
Granted: 1965-12-21
•
Expires: 1981-05-16
Abstract
No abstract record available.
Inventors
- 👤 William H Middendorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:05
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
APPARATUS FOR MEASURING THE SPEED OF A ROTATING MEMBER, SAID APPARATUS COMPRISING A TACHOMETER, SAID TACHOMETER INCLUDING A ROTOR ROTATABLE ABOUT AN AXIS AND HAVING A CYLINDRICAL CONDUCTIVE SURFACE AND A DIELECTRIC SHEATH OVERLYING SAID SURFACE, MEANS FOR CONNECTING SAID ROTOR FOR ROTATIONAL MOVEMENT WITH SAID ROTATING MEMBER, A FIRST ELECTRODE DISPOSED CLOSELY ADJACENT TO SAID ROTOR BUT SPACED FROM THE DIELECTRIC SHEATH THEREOF, AND A SECOND ELECTRODE DISPOSED CLOSELY ADJACENT TO THE ROTOR BUT SPACED FROM THE DIELECTRIC SHEATH PORTION THEREOF, SAID SECOND ELECTRODE BEING SPACED FROM SAID FIRST ELECTRODE CIRCUMFERENTIALLY WITH RESPECT TO SAID ROTOR, SAID ELECTRODES EXTENDING AXIALLY OF SAID ROTOR, MEANS FOR APPLYING A D.C. POTENTIAL ACROSS SAID ELECTRODES, SAID FIRST ELECTRODE BEING EFFECTIVE TO EMIT ELECTRONS, SAID SECOND ELECTRODE BEING EFFECTIVE TO COLLECT ELECTRONS PREVIOUSLY DEPOSITED ON SAID
Claim 2
Dependent Claim
133 words
APPARATUS FOR MEASURING THE SPEED OF A ROTATING MEMBER, SAID APPARATUS COMPRISING A TACHOMETER, SAID TACHOMETER INCLUDING A ROTOR ROTATABLE ABOUT AN AXIS AND HAVING A CYLINDRICAL CONDUCTIVE SURFACE AND A DIELECTRIC SHEATH OVERLYING SAID SURFACE, MEANS FOR CONNECTING SAID ROTOR FOR ROTATIONAL MOVEMENT WITH SAID ROTATING MEMBER, A FIRST ELECTRODE DISPOSED CLOSELY ADJACENT TO SAID ROTOR BUT SPACED FROM THE DIELECTRIC SHEATH THEREOF, AND A SECOND ELECTRODE DISPOSED CLOSELY ADJACENT TO THE ROTOR BUT SPACED FROM THE DIELECTRIC SHEATH PORTION THEREOF, SAID SECOND ELECTRODE BEING SPACED FROM SAID FIRST ELECTRODE CIRCUMFERENTIALLY WITH RESPECT TO SAID ROTOR, SAID ELECTRODES EXTENDING AXIALLY OF SAID ROTOR, MEANS FOR APPLYING A D.C. POTENTIAL ACROSS SAID ELECTRODES, SAID FIRST ELECTRODE BEING EFFECTIVE TO EMIT ELECTRONS, SAID SECOND ELECTRODE BEING EFFECTIVE TO COLLECT ELECTRONS PREVIOUSLY DEPOSITED ON SAID
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) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |