Patent DE379663C successfully refreshed from Google Patents.
US3754104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trimaran air bearing magnetic transducing assembly
Assignee: Fujitsu Services Ltd
•
Filing: 1971-07-22
•
Granted: 1973-08-21
•
Expires: 1991-07-22
Abstract
Abstract A magnetic transducing head is disclosed which is supported relative to a record medium by three pads spaced apart from one another in triangular formation. Two pieces of ferromagnetic material are bonded together by a non-magnetic material to produce an assembly having a transducing gap, the assembly being shaped in the region of the transducing gap to produce a magnetic head which also serves as one support pad. Two pads integrally formed on the ferromagnetic assembly provide the other supports.
Inventors
- 👤 R Piper
- 👤 K Stammers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:10
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005; G11B5/127; G11B5/133; G11B5/1335
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
A trimaran air bearing magnetic transducing head assembly including a low-inertia integral structure of ferromagnetic material having a body portion and three support projections extending in the same direction from the body portion, the support projections being spaced apart from one another in triangular formation and respectively having formed thereon air bearing support surfaces, all the air bearing support surfaces lying in a common plane, at least one of the support projections forming a first portion of a magnetic transducing head; the head further including a second ferromagnetic portion; non magnetic material bonded between the first and second portions to form a non-magnetic transducing gap lying substantially perpendicular to said common plane; and a winding threading the head.
Claim 2
Dependent Claim
118 words
A trimaran air bearing magnetic transducing head assembly including a low-inertia integral structure of ferromagnetic material having a body portion and three support projections extending in the same direction from the body portion, the support projections being spaced apart from one another in triangular formation and respectively having formed thereon air bearing support surfaces, all the air bearing support surfaces lying in a common plane, at least one of the support projections forming a first portion of a magnetic transducing head; the head further including a second ferromagnetic portion; non magnetic material bonded between the first and second portions to form a non-magnetic transducing gap lying substantially perpendicular to said common plane; and a winding threading the head.
Claim 3
Dependent Claim
28 words
A trimaran air bearing magnetic transducing head assembly as claimed in claim 1 in which at least one support projection forms a part of a further transducer head.
Claim 4
Dependent Claim
21 words
A air bearing magnetic transducing head assembly as claimed in claim 1 in which the ferromagnetic elements are formed of ferrite.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |