US4516176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head cleaning diskette
Assignee: Verbatim Corp
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Filing: 1982-05-10
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Granted: 1985-05-07
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Expires: 2002-05-10
Abstract
Abstract A disk having a thin flexible platter with a mildly abrasive coating on at least one side thereof for contacting and cleaning a magnetic head. The coating includes magnetite (Fe 3 O 4 ) having an internal crystalline form in the shape of octahedral crystals, conductive carbon black, a dispersing agent, a binder system, a cross-linker, and a lubricant. Since the magnetite is highly magnetic, data can be magnetically recorded on the coating for programming the magnetic head to be cycled across the coating to ensure a thorough cleaning of the head.
Inventors
- 👤 Jeffrey B. Street
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:51
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/41
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A diskette for cleaning a magnetic read/write head of a flexible disk drive, said diskette comprising a thin flexible platter, and a mildly abrasive magnetic coating on at least one side of the platter for contacting the read/write head, said coating including magnetite (Fe 3 O 4 ) having an internal crystalline form in the shape of octahedral crystals, conductive carbon black, a dispersing agent, a binder system, a cross linker, and a lubricant, said coating including data, magnetically recorded thereon, which is adapted for directing the read/write head across the diskette surface.
Claim 2
Dependent Claim
93 words
A diskette for cleaning a magnetic read/write head of a flexible disk drive, said diskette comprising a thin flexible platter, and a mildly abrasive magnetic coating on at least one side of the platter for contacting the read/write head, said coating including magnetite (Fe 3 O 4 ) having an internal crystalline form in the shape of octahedral crystals, conductive carbon black, a dispersing agent, a binder system, a cross linker, and a lubricant, said coating including data, magnetically recorded thereon, which is adapted for directing the read/write head across the diskette surface.
Claim 3
Dependent Claim
65 words
The diskette of claim 1 wherein said coating is composed of magnetite (Fe 3 O 4 ) having an internal crystalline form in the shape of octahedral crystals 60-70%, conductive carbon black 3-5%, a dispersing agent such as soya lecithin 1-2%, a binder system such as polyurethan 15-25%, a cross-linker such as polyisocyanate 2-10%, and a lubricant such as fatty acid ester 1-5% by weight.
Claim 4
Dependent Claim
88 words
In a flexible magnetic diskette for cleaning a read/write head of a flexible disk drive, the diskette of the type having a mildly abrasive magnetic coating the improvement comprising: a coating suitable for magnetically recording information thereon, and including magnetite (Fe 3 O 4 ) having an internal crystalline form in the shape of octahedral crystals, conductive carbon black, a dispersing agent, a binder system, a cross linker and a lubricant; and information, magnetically recorded on the coating and adapted for directing the read/write head across the diskette.
Claim 5
Dependent Claim
88 words
In a flexible magnetic diskette for cleaning a read/write head of a flexible disk drive, the diskette of the type having a mildly abrasive magnetic coating the improvement comprising: a coating suitable for magnetically recording information thereon, and including magnetite (Fe 3 O 4 ) having an internal crystalline form in the shape of octahedral crystals, conductive carbon black, a dispersing agent, a binder system, a cross linker and a lubricant; and information, magnetically recorded on the coating and adapted for directing the read/write head across the diskette.
Claim 6
Independent Claim
123 words
A method for cleaning a magnetic read/write head of a flexible disk drive comprising: inserting in a disk drive a flexible magnetic disk comprising a flexible platter, the platter having a magnetic recording surface coating, said coating comprising magnetite (Fe 3 O 4 ) having an internal crystalline form in the shape of octahedral crystals, conductive carbon black, a dispersing agent, a binder system, a cross-linker and a lubricant said coating having data magnetically recorded thereon adapted for directing a read/write head to move radially across the surface of the disk; and allowing the disk to remain in the disk drive for a preselected period of time while the head is directed across the disk to ensure a thorough cleaning of the head.
Claim 7
Independent Claim
123 words
A method for cleaning a magnetic read/write head of a flexible disk drive comprising: inserting in a disk drive a flexible magnetic disk comprising a flexible platter, the platter having a magnetic recording surface coating, said coating comprising magnetite (Fe 3 O 4 ) having an internal crystalline form in the shape of octahedral crystals, conductive carbon black, a dispersing agent, a binder system, a cross-linker and a lubricant said coating having data magnetically recorded thereon adapted for directing a read/write head to move radially across the surface of the disk; and allowing the disk to remain in the disk drive for a preselected period of time while the head is directed across the disk to ensure a thorough cleaning of the head.
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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) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |