US3123756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
figure
Assignee: —
•
Filing: —
•
Granted: 1964-03-03
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Expires: 1981-03-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:50
CPC Classifications
B; B66; B66C; B66C13/00; B66C13/18; B66C13/22; B66C13/23; B66C13/26; B66C2700/00; B66C2700/08; B66C2700/081
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A BRAKING SYSTEM FOR A WOUND ROTOR MOTOR THAT HAS A PRIMARY WINDING AND A ROTOR WINDING, COMPRISING A BRAKE ADAPTED TO BE COUPLED TO THE MOTOR THAT HAS ITS EXCITING MEMBER ELECTRICALLY CONNECTED IN A LOOP THAT ALSO INCLUDES A RESISTIVE IMPEDANCE, MEANS FOR PRODUCING A RELATIVELY CONSTANT VOLTAGE WHICH CAUSES A CURRENT TO FLOW AROUND SAID LOOP, AND REGULATING CIRCUIT MEANS IN SERIES WITH ONE PHASE OF THE ROTOR CIRCUIT FOR CAUSING A VOLTAGE TO APPEAR ACROSS SAID RESISTIVE IMPEDANCE THAT IS PROPORTIONAL TO THE LOAD ON THE MOTOR, THE POLARITY OF SAID VOLTAGE DROP BEING SUCH THAT IT OPPOSES SAID RELATIVELY CONSTANT VOLTAGE AND REDUCES THE RESULTING CURRENT FLOW AROUND SAID LOOP.
Claim 2
Dependent Claim
115 words
A BRAKING SYSTEM FOR A WOUND ROTOR MOTOR THAT HAS A PRIMARY WINDING AND A ROTOR WINDING, COMPRISING A BRAKE ADAPTED TO BE COUPLED TO THE MOTOR THAT HAS ITS EXCITING MEMBER ELECTRICALLY CONNECTED IN A LOOP THAT ALSO INCLUDES A RESISTIVE IMPEDANCE, MEANS FOR PRODUCING A RELATIVELY CONSTANT VOLTAGE WHICH CAUSES A CURRENT TO FLOW AROUND SAID LOOP, AND REGULATING CIRCUIT MEANS IN SERIES WITH ONE PHASE OF THE ROTOR CIRCUIT FOR CAUSING A VOLTAGE TO APPEAR ACROSS SAID RESISTIVE IMPEDANCE THAT IS PROPORTIONAL TO THE LOAD ON THE MOTOR, THE POLARITY OF SAID VOLTAGE DROP BEING SUCH THAT IT OPPOSES SAID RELATIVELY CONSTANT VOLTAGE AND REDUCES THE RESULTING CURRENT FLOW AROUND SAID LOOP.
References Cited (Backward Citations)
US2581292A
Cited
US2963634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-03 | 1967-09-02 | 1968-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-03 | 1971-09-02 | 1972-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-03 | 1975-09-02 | 1976-03-03 | $7700.00 | Window Closed / Lapsed |