US4589043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head having a thermoplastic or a thermosetting plastic housing
Assignee: Image Innovations Inc
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Filing: 1982-08-31
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Granted: 1986-05-13
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Expires: 2002-08-31
Abstract
Abstract A magnetic head for use with a magnetic tape information recording, storage and retrieval computer system which includes applying a hard, wear-resistant coating to an inexpensive molded plastic body to drastically reduce the cost of the magnetic head component without reducing its reliability or stability and also the method of producing such a magnetic head.
Inventors
- 👤 Matthias J. Grundtner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:07
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/10; G11B5/127; G11B5/187; G11B5/255; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49055
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
112 words
A magnetic head unit for computer equipment comprising, a body forming a magnetic transducer housing made from a thermoplastic or a thermosetting plastic material capable of being formed into the desired shape and dimensions and having a deflection temperature property according to ASTM standards of more than 400° F., and having magnetic transducer components mounted in said body and including core gaps which perform magnetic read-write functions said body including tape-engaging surfaces adjacent to the magnetic core gap components, a coating of wear-resistant material bonded to the tape-engaging surface to produce the desired wear resistance and mechanical stability to the tape-engaging surface and upper head portion required for such a magnetic head.
Claim 2
Dependent Claim
112 words
A magnetic head unit for computer equipment comprising, a body forming a magnetic transducer housing made from a thermoplastic or a thermosetting plastic material capable of being formed into the desired shape and dimensions and having a deflection temperature property according to ASTM standards of more than 400° F., and having magnetic transducer components mounted in said body and including core gaps which perform magnetic read-write functions said body including tape-engaging surfaces adjacent to the magnetic core gap components, a coating of wear-resistant material bonded to the tape-engaging surface to produce the desired wear resistance and mechanical stability to the tape-engaging surface and upper head portion required for such a magnetic head.
Claim 3
Dependent Claim
20 words
The structure set forth in claim 1 wherein the plastic body material is molded into the desired shape and dimensions.
Claim 4
Dependent Claim
15 words
The structure set forth in claim 2 wherein the body is made from thermoplastic material.
Claim 5
Dependent Claim
18 words
The structure set forth in claim 3 wherein said material constitutes polyphenylene sulfide resin reinforced with glass fiber.
Claim 6
Dependent Claim
14 words
The structure set forth in claim 2 wherein the body material constitutes thermosetting plastic.
Claim 7
Dependent Claim
16 words
The structure set forth in claim 5 wherein the thermosetting plastic body material constitutes an alkyd.
Claim 8
Dependent Claim
17 words
The structure set forth in claim 5 wherein the thermosetting plastic body material constitutes a diallyl phthalate.
Claim 9
Dependent Claim
16 words
The structure set forth in claim 5 wherein the thermosetting plastic body material constitutes an epoxy.
Claim 10
Dependent Claim
16 words
The structure set forth in claim 5 wherein the thermosetting plastic body material constitutes a phenolic.
Claim 11
Dependent Claim
16 words
The structure set forth in claim 5 wherein the thermosetting plastic body material constitutes thermosetting polyester.
Claim 12
Dependent Claim
16 words
The structure set forth in claim 5 wherein the thermosetting plastic body material constitutes a polyimide.
Claim 13
Dependent Claim
17 words
The structure set forth in claim 1 wherein the material is capable of being cast and sintered.
Claim 14
Dependent Claim
13 words
The structure set forth in claim 12 wherein the body material is polyimide.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |