US5580602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a thin film magnetic head
Assignee: International Business Machines Corp
•
Filing: 1994-09-01
•
Granted: 1996-12-03
•
Expires: 2014-09-01
Abstract
Abstract An improved process for making thin film magnetic heads using an insulation comprising a polymer, a crosslinking agent, and 4-sulfonate diazonaphthoquinone.
Inventors
- 👤 Dennis R. McKean
- 👤 Alfred F. Renaldo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:06
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/3967; G11B5/31; G11B5/3109; G11B5/3116; G11B5/313; G11B5/3163; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49043; Y10T29/49044
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
126 words
A process for making a thin film magnetic head comprising the steps of: (a) forming a first pole piece layer of magnetic material; (b) depositing a gap-forming layer of nonmagnetic material over said first pole piece layer; (c) depositing a first layer of insulation material on the gap-forming layer; (d) forming a conductive coil on said first layer of insulating material; (e) depositing a second layer of insulation material over said conductive coil, the insulation material comprising a novolak resin, 1-diazo-2-oxo-4-cumylphenyl napthalene sulfonate, and less than 20 weight % of hexamethoxymethylmelamine; (f) heating the second layer of insulating material to a temperature up to 180° C. to crosslink the polymer; and (g) depositing a second pole piece layer of magnetic material to complete the magnetic head.
Claim 2
Dependent Claim
126 words
A process for making a thin film magnetic head comprising the steps of: (a) forming a first pole piece layer of magnetic material; (b) depositing a gap-forming layer of nonmagnetic material over said first pole piece layer; (c) depositing a first layer of insulation material on the gap-forming layer; (d) forming a conductive coil on said first layer of insulating material; (e) depositing a second layer of insulation material over said conductive coil, the insulation material comprising a novolak resin, 1-diazo-2-oxo-4-cumylphenyl napthalene sulfonate, and less than 20 weight % of hexamethoxymethylmelamine; (f) heating the second layer of insulating material to a temperature up to 180° C. to crosslink the polymer; and (g) depositing a second pole piece layer of magnetic material to complete the magnetic head.
Claim 3
Dependent Claim
131 words
A process for making the thin film magnetic write head of a magnetroresistive read/write head comprising the steps of: (a) forming a first pole piece layer of magnetic material; (b) depositing a gap-forming layer of nonmagnetic material over said first pole piece layer; (c) depositing a first layer of insulation material on the gap-forming layer; (d) forming a conductive coil on said first layer of insulating material; (e) depositing a second layer of insulation material over said conductive coil, the insulation material comprising a novolak resin, 1-diazo-2-oxo-4-cumylphenyl naphthalene sulfonate, and less than 20 weight % of hexamethoxymethylmelamine: (f) heating the second layer of insulating material to a temperature up to 180° C. to crosslink the polymer; and (g) depositing a second layer of magnetic material to complete the magnetic write head.
Claim 4
Dependent Claim
131 words
A process for making the thin film magnetic write head of a magnetroresistive read/write head comprising the steps of: (a) forming a first pole piece layer of magnetic material; (b) depositing a gap-forming layer of nonmagnetic material over said first pole piece layer; (c) depositing a first layer of insulation material on the gap-forming layer; (d) forming a conductive coil on said first layer of insulating material; (e) depositing a second layer of insulation material over said conductive coil, the insulation material comprising a novolak resin, 1-diazo-2-oxo-4-cumylphenyl naphthalene sulfonate, and less than 20 weight % of hexamethoxymethylmelamine: (f) heating the second layer of insulating material to a temperature up to 180° C. to crosslink the polymer; and (g) depositing a second layer of magnetic material to complete the magnetic write head.
References Cited (Backward Citations)
US4318148A
Cited
US4685014A
Cited
US4651248A
Cited
US4550353A
Cited
US5256522A
Cited
US4652954A
Cited
US4875124A
Cited
US5241440A
Cited
US5188920A
Cited
US5206590A
Cited
US5283155A
Cited
US5159513A
Cited
US5283374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-03 | 2000-06-03 | 2000-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-03 | 2004-06-03 | 2004-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-03 | 2008-06-03 | 2008-12-03 | $7700.00 | Window Closed / Lapsed |