US3254319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable inductors
Assignee: US Philips Corp
•
Filing: 1961-04-25
•
Granted: 1966-05-31
•
Expires: 1981-04-25
Abstract
No abstract record available.
Inventors
- 👤 Olsen Eigil
- 👤 Finck Johan Christiaan Jacobus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:53
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F17/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
AN INDUCTANCE DEVICE COMPRISING A CORE STRUCTURE IN CLUDING FIRST AND SECOND POT-SHAPED OPPOSED MEMBERS COMPOSED OF MAGNETIC MATERIAL AND HAVING OUTER RIMS DISPOSED IN ABUTTING RELATION, SAID CORE STRUCTURE FURTHER COMPRISING FIRST AND SECOND TUBULAR MEMBERS COAXIALLY ARRANGED IN CONFRONTING RELATIONSHIP TO DEFINE AN AXIAL BORE HAVING A CYLINDRICAL CONFIGURATION OF UNFORM DIAMETER AND WITH THEIR ADJACENT ENDS SPACED APART TO DEFINE A COAXIAL ANNULAR AIR GAP, SAID POT-SHAPED MEMBERS AND SAID TUBULAR MEMBERS DEFINING A SUBSTANTIALLY CLOSED ANNULAR RECESS THEREBETWEEN, A COIL MOUNTED IN SAID ANNULAR RECESS, AND AN ADJUSTABLE MEMBER MOUNTED FOR AXIAL MOVEMENT WITHIN SAID BORE, SAID MEMBER COMPRISING A CONICAL FRUSTRUM OF ELASTIC FERROMAGNETIC MATERIAL HAVING A MAXIMUM DIAMETER NORMALLY LARGER THAN AND A MINIMUM DIAMETER SMALLER THAN THE DIAMETER OF SAID BORE.
Claim 2
Dependent Claim
128 words
AN INDUCTANCE DEVICE COMPRISING A CORE STRUCTURE IN CLUDING FIRST AND SECOND POT-SHAPED OPPOSED MEMBERS COMPOSED OF MAGNETIC MATERIAL AND HAVING OUTER RIMS DISPOSED IN ABUTTING RELATION, SAID CORE STRUCTURE FURTHER COMPRISING FIRST AND SECOND TUBULAR MEMBERS COAXIALLY ARRANGED IN CONFRONTING RELATIONSHIP TO DEFINE AN AXIAL BORE HAVING A CYLINDRICAL CONFIGURATION OF UNFORM DIAMETER AND WITH THEIR ADJACENT ENDS SPACED APART TO DEFINE A COAXIAL ANNULAR AIR GAP, SAID POT-SHAPED MEMBERS AND SAID TUBULAR MEMBERS DEFINING A SUBSTANTIALLY CLOSED ANNULAR RECESS THEREBETWEEN, A COIL MOUNTED IN SAID ANNULAR RECESS, AND AN ADJUSTABLE MEMBER MOUNTED FOR AXIAL MOVEMENT WITHIN SAID BORE, SAID MEMBER COMPRISING A CONICAL FRUSTRUM OF ELASTIC FERROMAGNETIC MATERIAL HAVING A MAXIMUM DIAMETER NORMALLY LARGER THAN AND A MINIMUM DIAMETER SMALLER THAN THE DIAMETER OF SAID BORE.
References Cited (Backward Citations)
GB493213A
Cited
US2318415A
Cited
US2427872A
Cited
US2388295A
Cited
US2768359A
Cited
US2717984A
Cited
US2786983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |