Patent US3307130A successfully refreshed from Google Patents.
US3307130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic device having a shunt plate
Assignee: Heinemann Electric Co
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Filing: 1965-01-13
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Granted: 1967-02-28
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Expires: 1985-01-13
Abstract
No abstract record available.
Inventors
- 👤 William W Camp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:10
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/12; H01H71/24; H01H71/34; H01H71/345
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
143 words
AN ELECTROMAGNETIC DEVICE COMPRISING AN ARMATURE, A SOLENOID COIL, A MAGNETIZABLE FRAME CARRYING SAID ARMATURE AND COIL, A MAGNETIZABLE CORE MOVABLE BY THE MAGNETIC FIELD OF SAID COIL, A TUBE HOUSING SAID CORE AND SURROUNDED IN PART BY SAID COIL, SAID TUBE BEING OF NONMAGNETIZABLE MATERIAL, A MAGNETIZABLE POLE PIECE MOUNTED AT ONE END OF SAID TUBE AND TOWARD WHICH SAID CORE IS ATTRACTABLE, SAID POLE PIECE DEFINING WITH SAID CORE A FIRST MAGNETIC GAP, A MAGNETIC SHUNTING RING OF MAGNETIZABLE MATERIAL PLACED INTERMEDIATE SAID POLE PIECE AND SAID CORE AND SURROUNDING SAID FIRST MAGNETIC GAP TO DEFINE WITH SAID CORE A SECOND MAGNETIC GAP, SAID SHUNTING RING DEFINING WITH SAID FRAME A THIRD GAP, AND AN INSULATING RING SPACING SAID SHUNTING RING FROM SAID POLE PIECE ALONG THE LONGITUDINAL AXIS OF SAID TUBE AND SPACING SAID SHUNTING RING RADIALLY FROM SAID TUBE.
References Cited (Backward Citations)
US3081387A
Cited
US3193739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |