Patent US4755246A successfully refreshed from Google Patents.
US4755246A
Expired / Lapsed
US
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Method of making a laminated head cleaning disk
Assignee: Visa Technologies Inc
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Filing: 1986-10-24
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Granted: 1988-07-05
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Expires: 2006-10-24
Abstract
Abstract A cleaning disk is described that is made of a pair of layers of head-cleaning material which are translucent to light produced by a light source in a magnetic disk-reading machine. The layers are adhered with an adhesive having sufficient opacity caused by the addition of pigment to reduce the light transmitted through the layers from the light source enough to prevent sensing of the light by the corresponding light sensor. Fibers of the layers, when made of fabric, may extend through the adhesive to provide for permeation of a solvent from one layer to the other. The layers are preferably adhered by heat plastified thermoplastic polymeric adhesive which is compressed between non-heat-plastified layers and which is formed to have solvent-transmitting holes extending through it.
Inventors
- 👤 Victor Monia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:55
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/41; G11B23/00; G11B23/0014; G11B23/0021
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A method of making a head-cleaning disk for cleaning magnetic transducer heads in magnetic disk-reading machines comprising: producing a solvent permeable film of heat plastified thermoplastic material; adding a light transmission reducing pigment to said thermoplastic material; pressing confronting faces of a pair of layers of a non-heat plastified head-cleaning material against opposite faces of the film; cooling the resulting laminate until the film hardens; and stamping said laminate into the form of a cleaning disk provided with a centrally disposed first aperture and a second aperture spaced apart from said first aperture.
Claim 2
Independent Claim
93 words
A method of making a head-cleaning disk for cleaning magnetic transducer heads in magnetic disk-reading machines comprising: producing a solvent permeable film of heat plastified thermoplastic material; adding a light transmission reducing pigment to said thermoplastic material; pressing confronting faces of a pair of layers of a non-heat plastified head-cleaning material against opposite faces of the film; cooling the resulting laminate until the film hardens; and stamping said laminate into the form of a cleaning disk provided with a centrally disposed first aperture and a second aperture spaced apart from said first aperture.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein said step of producing further includes heat plastifying a thermoplastic material and extruding the heat plastified thermoplastic material into a film.
Claim 4
Dependent Claim
24 words
The method of claim 2 wherein said step of pressing is performed while the extruded film remains substantially fluid from the heat of extruding.
Claim 5
Dependent Claim
24 words
The method of claim 1, wherein the layers are made of a fabric and said pressing further includes penetrating fabric fibers through the film.
Claim 6
Independent Claim
63 words
A method of making a head-cleaning disk for cleaning magnetic transducer heads in magnetic disk-reading machines comprising: producing a film of heat plastified thermoplastic material; providing solvent transmitting pores extending through said film by pressing confronting faces of pair of fibrous layers of a non-heat plastified head-cleaning material against opposite faces of the film; and cooling the resulting laminate until the film hardens.
Claim 7
Independent Claim
63 words
A method of making a head-cleaning disk for cleaning magnetic transducer heads in magnetic disk-reading machines comprising: producing a film of heat plastified thermoplastic material; providing solvent transmitting pores extending through said film by pressing confronting faces of pair of fibrous layers of a non-heat plastified head-cleaning material against opposite faces of the film; and cooling the resulting laminate until the film hardens.
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) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |