US3663767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head
Assignee: Toshiba Corp
•
Filing: 1969-11-12
•
Granted: 1972-05-16
•
Expires: 1989-11-12
Abstract
Abstract A magnetic head used in recording information in a magnetic tape or reading out the information already stored therein, which comprises a pair of head tips oppositely formed at the end with a minute gap allowed therebetween, each of the head tips being made of an alloy essentially consisting of 3 to 18 percent by weight of aluminum, 0 to 12 percent by weight of silicon, and iron and impurities as the remainder and at least part of the surface area of the head tip contacting the magnetic tape being provided with a nitride layer containing 10 to 12 percent by weight of nitrogen.
Inventors
- 👤 Kazumi Shimotori
- 👤 Michiyasu Takagi
- 👤 Yoshihisa Kawamura
- 👤 Shoichi Kiyooka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/255; B; B22; B22D; B22D11/00; B22D11/06; B22D11/0602
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
17 words
The magnetic head according to claim 1 wherein the nitride layer is 2 to 50 microns thick.
Claim 2
Dependent Claim
52 words
The magnetic head according to claim 1 wherein the alloy constituting the head tip contains at least one element of the group consisting of titanium, hafnium, thorium, cerium, lanthanum, scandium, cadmium, tantalum, magnesium, molybdenum and chromium, in amounts equivalent to 3 percent by weight max. on the basis of the entire alloy.
Claim 3
Dependent Claim
19 words
The magnetic head according to claim 1 wherein the alloy constituting the head tip is of the polycrystal type.
Claim 4
Dependent Claim
20 words
The magnetic head according to claim 1 wherein the alloy constituting the head tip is of the single crystal type.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |