US4885650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head having boron carbide surfaces
Assignee: Unisys Corp
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Filing: 1988-04-25
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Granted: 1989-12-05
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Expires: 2008-04-25
Abstract
Abstract A magnetic head for reading or writing information magnetically encoded on a substrate is disclosed. Included in the head are a magnetic core and a boron carbide contact surface which the substrate rubs against during reading or writing. The boron carbide contact surface is electrically conductive and is resistent to wear. Grounding of the conductive boron carbide contact surface avoids static electric charge build up on the contact surface caused by rubbing of the substrate against the magnetic head.
Inventors
- 👤 Eugene F. Banka
- 👤 Charles B. Hebeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:23
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/08; G06K7/082; G06K7/083; G06K7/084; G11; G11B; G11B5/00; G11B5/10; G11B5/11
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
A magnetic head for reading or writing information magnetically encoded on a substrate which is moved relative to the magnetic head such that the substrate rubs against the magnetic head, comprising: a magnetic core; a plurality of pole tips conductively connected to said magnetic core; a wire coil wrapped around said magnetic core; an electrically conductive housing enclosing said magnetic core, said housing being connected to ground and being electrically isolated from said magnetic core; a conductive boron carbide contact surface on the magnetic core and in contact with said electrically conductive housing and adjacent to the pole tips against which the substrate rubs against as the substrate is moved relative to the magnetic head,; and means for electrically grounding said contact surface to said housing and to ground and means for electrically isolating said contact surface from said magnetic core.
Claim 2
Dependent Claim
141 words
A magnetic head for reading or writing information magnetically encoded on a substrate which is moved relative to the magnetic head such that the substrate rubs against the magnetic head, comprising: a magnetic core; a plurality of pole tips conductively connected to said magnetic core; a wire coil wrapped around said magnetic core; an electrically conductive housing enclosing said magnetic core, said housing being connected to ground and being electrically isolated from said magnetic core; a conductive boron carbide contact surface on the magnetic core and in contact with said electrically conductive housing and adjacent to the pole tips against which the substrate rubs against as the substrate is moved relative to the magnetic head,; and means for electrically grounding said contact surface to said housing and to ground and means for electrically isolating said contact surface from said magnetic core.
Claim 3
Dependent Claim
24 words
The magnetic head as claimed in claim 1 wherein: the boron carbide contact surface comprises a pad which is attached to the magnetic core.
Claim 4
Dependent Claim
107 words
A magnetic head for reading or writing information magnetically encoded on a substrate which is moved relative to the head such that the substrate rubs against the magnetic head comprising: a magnetic core; an electrically conductive housing enclosing the magnetic core, said housing being connected to ground and electrically isolated from said magnetic core; and a boron carbide contact surface pad on said magnetic core in the area of the magnetic head which contacts the substrate as the substrate is moved relative to the magnetic head; said boron carbide contact surface pad being electrically connected to the electrically conductive housing and electrically isolated from said magnetic core.
Claim 5
Dependent Claim
107 words
A magnetic head for reading or writing information magnetically encoded on a substrate which is moved relative to the head such that the substrate rubs against the magnetic head comprising: a magnetic core; an electrically conductive housing enclosing the magnetic core, said housing being connected to ground and electrically isolated from said magnetic core; and a boron carbide contact surface pad on said magnetic core in the area of the magnetic head which contacts the substrate as the substrate is moved relative to the magnetic head; said boron carbide contact surface pad being electrically connected to the electrically conductive housing and electrically isolated from said magnetic core.
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) | 1992-12-04 | 1993-06-05 | 1993-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-04 | 1997-06-05 | 1997-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-04 | 2001-06-05 | 2001-12-05 | $7700.00 | Window Closed / Lapsed |