US3333066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head assembly having rotatable and separable pole pieces
Assignee: Ampex Corp
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Filing: 1964-07-29
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Granted: 1967-07-25
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Expires: 1984-07-29
Abstract
No abstract record available.
Inventors
- 👤 Clarence K Studley
- 👤 William T Frost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:19
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B15/00; G11B15/60; G11B15/61; G11B5/187; G11B5/48; G11B5/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A MAGNETIC HEAD ASSEMBLY, COMPRISING: NON-MAGNETIC BASE MEMBER; MAGNETIC MEMBER DEFINING A PRINCIPAL PORTION OF A LOW RELUCTANCE PATH MOUNTED IN SAID BASE MEMBER AND POSITIONED ADJACENT TO A RECORDING SURFACE; INDEPENDENTLY MAGNETIC POLE PIECE MEMBER INCLUDING AT LEAST TWO POLE TIP PAIRS; AND MEANS FOR ROTATABLY AND SELECTIVELY MOUNTING SAID POLE PIECE MEMBER AGAINST SAID BASE MEMBER WITH A SELECTED ONE OF SAID POLE TIP PAIRS BEING POSITIONED ADJACENT SAID RECORDING SURFACE AND ADJACENT TO SAID MAGNETIC MEMBER SUCH THAT THE LOW RELUCTANCE MAGNETIC PATH EXTENDS FROM ONLY ONE POLE TIP PAIR AND AROUND SAID MAGNETIC MEMBER.
Claim 2
Dependent Claim
98 words
A MAGNETIC HEAD ASSEMBLY, COMPRISING: NON-MAGNETIC BASE MEMBER; MAGNETIC MEMBER DEFINING A PRINCIPAL PORTION OF A LOW RELUCTANCE PATH MOUNTED IN SAID BASE MEMBER AND POSITIONED ADJACENT TO A RECORDING SURFACE; INDEPENDENTLY MAGNETIC POLE PIECE MEMBER INCLUDING AT LEAST TWO POLE TIP PAIRS; AND MEANS FOR ROTATABLY AND SELECTIVELY MOUNTING SAID POLE PIECE MEMBER AGAINST SAID BASE MEMBER WITH A SELECTED ONE OF SAID POLE TIP PAIRS BEING POSITIONED ADJACENT SAID RECORDING SURFACE AND ADJACENT TO SAID MAGNETIC MEMBER SUCH THAT THE LOW RELUCTANCE MAGNETIC PATH EXTENDS FROM ONLY ONE POLE TIP PAIR AND AROUND SAID MAGNETIC MEMBER.
References Cited (Backward Citations)
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 |