US3353040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodynamic transducer
Assignee: Individual
•
Filing: 1965-07-20
•
Granted: 1967-11-14
•
Expires: 1985-07-20
Abstract
No abstract record available.
Inventors
- 👤 Frank R Abbott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:46
CPC Classifications
H; H02; H02K; H02K33/00; H02K33/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A TRANSDUCER COMPRISING: TWO COAXIAL CYLINDERS, ONE TELESCOPED IN AND RECIPROCABLY MOUNTED WITHIN THE OTHER; THE OPPOSING SURFACES OF THE CYLINDERS BEING OF FERROMAGNETIC MATERIAL, AND THE OPPOSING SURFACES EACH BEING SPIRALLY GROOVED TO DEFINE ELONGATED NARROW AREAS SPIRALLED ABOUT SAID OPPOSING SURFACES, THE GROOVES BEING DOUBLED SO THAT THE AXIAL LEAD IS TWICE THE GROOVE PITCH; AND BIFILAR WINDINGS IN SAID GROOVES TO OPPOSITELY MAGNETICALLY POLARIZE ALTERNATE SPIRALLED CYLINDRICAL SURFACES.
Claim 2
Dependent Claim
71 words
A TRANSDUCER COMPRISING: TWO COAXIAL CYLINDERS, ONE TELESCOPED IN AND RECIPROCABLY MOUNTED WITHIN THE OTHER; THE OPPOSING SURFACES OF THE CYLINDERS BEING OF FERROMAGNETIC MATERIAL, AND THE OPPOSING SURFACES EACH BEING SPIRALLY GROOVED TO DEFINE ELONGATED NARROW AREAS SPIRALLED ABOUT SAID OPPOSING SURFACES, THE GROOVES BEING DOUBLED SO THAT THE AXIAL LEAD IS TWICE THE GROOVE PITCH; AND BIFILAR WINDINGS IN SAID GROOVES TO OPPOSITELY MAGNETICALLY POLARIZE ALTERNATE SPIRALLED CYLINDRICAL SURFACES.
References Cited (Backward Citations)
US2878632A
Cited
US3201670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |