Patent US3333275A successfully refreshed from Google Patents.
US3333275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording head
Assignee: Individual
•
Filing: 1963-08-30
•
Granted: 1967-07-25
•
Expires: 1983-08-30
Abstract
No abstract record available.
Inventors
- 👤 Fritz A Guerth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:05
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/008; G11B5/00813; G11B15/00; G11B15/02; G11B15/12; G11B20/00; G11B20/02; G11B20/08; G11B20/10; G11B20/12; G11B20/1201; G11B20/1202; G11B20/1205; G11B23/00; G11B23/0007; G11B27/00; G11B27/10; G11B27/34; G11B5/127; G11B5/187; G11B5/33; G11B5/35; G11B5/48; G11B5/49; G11B5/4907; G11B5/4969; G11B5/54; G11B5/55; G11B5/5504; G11B5/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A RECORDING HEAD ASSEMBLY OPERATING AS A MAGNETIC SWITCH, SAID ASSEMBLY INCLUDING A PERMANENT MAGNET, A MEMBER OF CONDUCTIVE FERROMAGNETIC MATERIAL, A PAIR OF PLATES COMPOSED OF NONCONDUCTIVE FERROMAGNETIC MATERIAL, BOTH SAID PERMANENT MAGNET AND SAID CONDUCTIVE FERROMAGNETIC MEMBER BEING DISPOSED SIDE-BY-SIDE BETWEEN SAID PAIR OF PLATES SO THAT EACH OF THE FORMER CONTACTS EACH PLATE OF SAID PAIR, SAID CONDUCTIVE FERROMAGNETIC MEMBER BEING SPACED INWARDLY FROM ONE EDGE OF SAID PLATES SO THAT AN OPEN GAP IS FORMED BETWEEN SUCH EDGES, AND MEANS FOR ENERGIZING SAID ASSEMBLY TO CAUSE BOTH THE FLUX PRODUCED BY SAID ENERGIZATION, AS WELL AS THE FLUX
Claim 2
Dependent Claim
102 words
A RECORDING HEAD ASSEMBLY OPERATING AS A MAGNETIC SWITCH, SAID ASSEMBLY INCLUDING A PERMANENT MAGNET, A MEMBER OF CONDUCTIVE FERROMAGNETIC MATERIAL, A PAIR OF PLATES COMPOSED OF NONCONDUCTIVE FERROMAGNETIC MATERIAL, BOTH SAID PERMANENT MAGNET AND SAID CONDUCTIVE FERROMAGNETIC MEMBER BEING DISPOSED SIDE-BY-SIDE BETWEEN SAID PAIR OF PLATES SO THAT EACH OF THE FORMER CONTACTS EACH PLATE OF SAID PAIR, SAID CONDUCTIVE FERROMAGNETIC MEMBER BEING SPACED INWARDLY FROM ONE EDGE OF SAID PLATES SO THAT AN OPEN GAP IS FORMED BETWEEN SUCH EDGES, AND MEANS FOR ENERGIZING SAID ASSEMBLY TO CAUSE BOTH THE FLUX PRODUCED BY SAID ENERGIZATION, AS WELL AS THE FLUX
References Cited (Backward Citations)
US2901549A
Cited
US2862066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-24 | 1971-01-23 | 1971-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-24 | 1975-01-23 | 1975-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-24 | 1979-01-23 | 1979-07-25 | $7700.00 | Window Closed / Lapsed |