Patent US2829188A successfully refreshed from Google Patents.
Patent US4875124A successfully refreshed from Google Patents.
US4875124A
Expired / Lapsed
US
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Thin film magnetic heads with thermally crosslinked insulation
Assignee: HGST Netherlands BV
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Filing: 1988-04-18
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Granted: 1989-10-17
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Expires: 2008-04-18
Abstract
Abstract A thin film magnetic head is provided in which the electrical insulation surrounding the conductive coil comprises a photosensitive resin which has been crosslinked by a thermally activated crosslinking agent or promotor. The addition of the thermally activated crosslinking agent or promotor greatly reduces both the cure temperature and cure time and results in enhanced dimensional stability without any deleterious effects.
Inventors
- 👤 Heidi L. Dickstein
- 👤 Hiroyuki Hiraoka
- 👤 James H. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:25
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
32 words
A thin film magnetic head characterized in that the electrical insulation which surrounds the conductive coil comprises a photosensitive resin which has been crosslinked by a thermally activated crosslinking agent or promotor.
Claim 2
Dependent Claim
32 words
A thin film magnetic head characterized in that the electrical insulation which surrounds the conductive coil comprises a photosensitive resin which has been crosslinked by a thermally activated crosslinking agent or promotor.
Claim 3
Dependent Claim
19 words
A thin film magnetic head as claimed in claim 1 in which the photosensitive resin is a novolac resin.
Claim 4
Dependent Claim
32 words
A thin film magnetic head as claimed in claim 2 in which the thermally activated crosslinking agent or promotor comprises from about 10 to about 50% by weight of the novolac resin.
Claim 5
Dependent Claim
18 words
A thin film magnetic head as claimed in claim 1 in which the crosslinking agent is a melamine.
Claim 6
Dependent Claim
25 words
A thin film magnetic head as claimed in claim 1 in which the crosslinking agent is an epoxy cresol novolac resin containing a latent catalyst.
Claim 7
Dependent Claim
20 words
A thin film magnetic head as claimed in claim 1 in which the crosslinking promotor is of the bisazide 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) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |