US3108216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric speedometer drive
Assignee: Motors Liquidation Co
•
Filing: 1959-12-03
•
Granted: 1963-10-22
•
Expires: 1979-12-03
Abstract
No abstract record available.
Inventors
- 👤 William E Fritz
- 👤 Donald W Laviana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:26
CPC Classifications
G; G01; G01P; G01P1/00; G01P1/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A TRANSMITTER FOR AN ELECTRIC SPEEDOMETER DRIVE INCLUDING, A HOUSING HAVING A CUP-SHAPED RECESS, A ROTATABLE BRUSH DRUM COAXIALLY DISPOSED WITHIN SAID RECESS, A DRIVE SHAFT ROTATABLY SUPPORTED IN SAID HOUSING AND CONNECTED TO SAID BRUSH DRUM, A STATIONARY DISC TYPE COMMUTATOR ATTACHED TO SAID HOUSING AND CLOSING THE OPEN END OF SAID CUP-SHAPED RECESS, SAID COMMUTATOR HAVING THREE CIRCUMFERENTIALLY SPACED SEGMENTS THEREON, AND A PAIR OF DIAMETRICALLY OPPOSED BRUSH SETS CARRIED BY SAID BRUSH DRUM AND ENGAGING SAID COMMUTATOR SEGMENTS, SAID PAIR OF BRUSH SETS BEING CONNECTED TO A SOURCE OF DIRECT CURRENT WHEREBY ROTATION OF THE BRUSH RELATIVE TO THE COMMUTATOR WILL PRODUCE A THREE PHASE ALTERNATING CURRENT SIGNAL HAVING A FREQUENCY PROPORTIONAL TO THE ROTATIVE SPEED OF SAID DRIVE SHAFT, EACH BRUSH SET COMPRISING A PAIR OF ANGULARLY SPACED, ELECTRICALLY INTERCONNECTED BRUSHES.
Claim 2
Dependent Claim
135 words
A TRANSMITTER FOR AN ELECTRIC SPEEDOMETER DRIVE INCLUDING, A HOUSING HAVING A CUP-SHAPED RECESS, A ROTATABLE BRUSH DRUM COAXIALLY DISPOSED WITHIN SAID RECESS, A DRIVE SHAFT ROTATABLY SUPPORTED IN SAID HOUSING AND CONNECTED TO SAID BRUSH DRUM, A STATIONARY DISC TYPE COMMUTATOR ATTACHED TO SAID HOUSING AND CLOSING THE OPEN END OF SAID CUP-SHAPED RECESS, SAID COMMUTATOR HAVING THREE CIRCUMFERENTIALLY SPACED SEGMENTS THEREON, AND A PAIR OF DIAMETRICALLY OPPOSED BRUSH SETS CARRIED BY SAID BRUSH DRUM AND ENGAGING SAID COMMUTATOR SEGMENTS, SAID PAIR OF BRUSH SETS BEING CONNECTED TO A SOURCE OF DIRECT CURRENT WHEREBY ROTATION OF THE BRUSH RELATIVE TO THE COMMUTATOR WILL PRODUCE A THREE PHASE ALTERNATING CURRENT SIGNAL HAVING A FREQUENCY PROPORTIONAL TO THE ROTATIVE SPEED OF SAID DRIVE SHAFT, EACH BRUSH SET COMPRISING A PAIR OF ANGULARLY SPACED, ELECTRICALLY INTERCONNECTED BRUSHES.
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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) | 1966-10-21 | 1967-04-22 | 1967-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-21 | 1971-04-22 | 1971-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-21 | 1975-04-22 | 1975-10-22 | $7700.00 | Window Closed / Lapsed |