Patent US2087442A successfully refreshed from Google Patents.
Patent US3274412A successfully refreshed from Google Patents.
US3274412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound direct current motors
Assignee: General Electric Co
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Filing: 1963-09-18
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Granted: 1966-09-20
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Expires: 1983-09-18
Abstract
No abstract record available.
Inventors
- 👤 Fisher Alec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:16
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A COMPOUND DIRECT CURRENT MOTOR COMPRISING: (A) AN ARMATURE; (B) A PLURALITY OF MAGNETIZABLE MEMBERS ARRANGED TO COACT WITH SAID ARMATURE, EACH OF SAID MEMBERS INCLUDING A CORE AND A POLE SHOE REGION TERMINATING NEAR SAID ARMATURE AND DEFINING SPACED APART, MECHANICALLY INTEGRATED MAIN AND COMMUTATING POLE SHOES; (C) FIRST MAGNETIC EXCITATION MEANS ARRANGED ON A FIRST CORE PORTION OF EACH OF SAID MAGNETIZABLE MEMBERS FOR PROVIDING A MAGNETOMOTIVE FORCE WHICH IS PROPORTIONAL TO MOTOR CURRENT, SAID MEANS BEING A WINDING CONNECTED IN SERIES WITH THE ARMATURE CIRCUIT OF SAID MOTOR AND PROVIDING COMMUTATING POLE SHOE FLUX AND A COMPONENT OF THE MAIN POLE SHOE FLUX; (D) AND A SECOND MAGNETIC EXCITATION MEANS ASSOCIATED WITH EACH OF SAID MAGNETIZABLE MEMBERS, SAID SECON MAGNETIC EXCITATION MEANS BEING A PERMANENT MAGNETIC DISPOSED ADJACENT AND IN CONTACT WITH A PORTION OF THE MAIN POLE SHOE OF EACH OF SAID MAGNETICABLE MEMBERS.
Claim 2
Dependent Claim
148 words
A COMPOUND DIRECT CURRENT MOTOR COMPRISING: (A) AN ARMATURE; (B) A PLURALITY OF MAGNETIZABLE MEMBERS ARRANGED TO COACT WITH SAID ARMATURE, EACH OF SAID MEMBERS INCLUDING A CORE AND A POLE SHOE REGION TERMINATING NEAR SAID ARMATURE AND DEFINING SPACED APART, MECHANICALLY INTEGRATED MAIN AND COMMUTATING POLE SHOES; (C) FIRST MAGNETIC EXCITATION MEANS ARRANGED ON A FIRST CORE PORTION OF EACH OF SAID MAGNETIZABLE MEMBERS FOR PROVIDING A MAGNETOMOTIVE FORCE WHICH IS PROPORTIONAL TO MOTOR CURRENT, SAID MEANS BEING A WINDING CONNECTED IN SERIES WITH THE ARMATURE CIRCUIT OF SAID MOTOR AND PROVIDING COMMUTATING POLE SHOE FLUX AND A COMPONENT OF THE MAIN POLE SHOE FLUX; (D) AND A SECOND MAGNETIC EXCITATION MEANS ASSOCIATED WITH EACH OF SAID MAGNETIZABLE MEMBERS, SAID SECON MAGNETIC EXCITATION MEANS BEING A PERMANENT MAGNETIC DISPOSED ADJACENT AND IN CONTACT WITH A PORTION OF THE MAIN POLE SHOE OF EACH OF SAID MAGNETICABLE MEMBERS.
References Cited (Backward Citations)
US1045159A
Cited
US1244868A
Cited
US1637887A
Cited
US1994609A
Cited
US2030108A
Cited
US2417120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |