US3128441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable dynamo transformer having linearly movable armature
Assignee: Northrop Grumman Corp
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Filing: 1960-06-30
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Granted: 1964-04-07
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Expires: 1980-06-30
Abstract
No abstract record available.
Inventors
- 👤 Ernest W Johnson
- 👤 Packard Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:30
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/08; H01F29/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
IN A VARIABLE DYNAMO TRANSFORMER, THE COMBINATION OF FIRST AND SECOND ADJACENT STATOR MEMBERS SPACED APART ALONG A COMMON AXIS, AN ARMATURE COMPOSED OF A HOMOGENEOUS LENGTH OF MAGNETIC MATERIAL AND OF ANNULAR CROSS-SECTION DISPOSED COAXIALLY WITHIN SAID STATOR MEMBERS SUCH THAT ITS PERIPHERAL AREA MAY BE PROJECTED UPON SAID STATOR MEMBERS, THE PROJECTED AREA OF SAID ARMATURE UPON SAID FIRST STATOR MEMBER BEING NORMALLY SUBSTANTIALLY EQUAL TO THE PROJECTED AREA OF SAID ARMATURE UPON SAID SECOND STATOR MEMBER, MEANS FOR DISPLACING SAID ARMATURE IN EITHER DIRECTION ALONG SAID AXIS, AN INPUT COIL HAVING A FIRST WINDING ON SAID FIRST STATOR MEMBER AND A SECOND WINDING ON SAID SECOND STATOR MEMBER CONNECTED IN SERIES, AND AN OUTPUT COIL HAVING A FIRST WINDING ON SAID FIRST STATOR MEMBER AND A SECOND WINDING ON SAID SECOND STATOR MEMBER, THE WINDINGS OF ONE OF SAID COILS BEING LIKE-POLED AND THE WINDINGS OF THE OTHER OF SAID COILS BEING OPPOSITELY POLED.
Claim 2
Dependent Claim
157 words
IN A VARIABLE DYNAMO TRANSFORMER, THE COMBINATION OF FIRST AND SECOND ADJACENT STATOR MEMBERS SPACED APART ALONG A COMMON AXIS, AN ARMATURE COMPOSED OF A HOMOGENEOUS LENGTH OF MAGNETIC MATERIAL AND OF ANNULAR CROSS-SECTION DISPOSED COAXIALLY WITHIN SAID STATOR MEMBERS SUCH THAT ITS PERIPHERAL AREA MAY BE PROJECTED UPON SAID STATOR MEMBERS, THE PROJECTED AREA OF SAID ARMATURE UPON SAID FIRST STATOR MEMBER BEING NORMALLY SUBSTANTIALLY EQUAL TO THE PROJECTED AREA OF SAID ARMATURE UPON SAID SECOND STATOR MEMBER, MEANS FOR DISPLACING SAID ARMATURE IN EITHER DIRECTION ALONG SAID AXIS, AN INPUT COIL HAVING A FIRST WINDING ON SAID FIRST STATOR MEMBER AND A SECOND WINDING ON SAID SECOND STATOR MEMBER CONNECTED IN SERIES, AND AN OUTPUT COIL HAVING A FIRST WINDING ON SAID FIRST STATOR MEMBER AND A SECOND WINDING ON SAID SECOND STATOR MEMBER, THE WINDINGS OF ONE OF SAID COILS BEING LIKE-POLED AND THE WINDINGS OF THE OTHER OF SAID COILS BEING OPPOSITELY POLED.
References Cited (Backward Citations)
US2870422A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |