US4557947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polishing the surfaces of magnetic storage disks
Assignee: Emtec Magnetics GmbH
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Filing: 1980-03-04
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Granted: 1985-12-10
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Expires: 2000-03-04
Abstract
Abstract A process for polishing the ground surfaces of magnetic storage disks which consist of a rigid substrate provided on both sides with a firmly adhering magnetic coating consisting of a magnetic material finely dispersed in an organic polymer and conventional additives, by pressing felt rings or felt disks against the moving magnetic storage disk, to the surface of which an aqueous emulsion containing butyl acetate with or without butane-1,4-diol is applied.
Inventors
- 👤 Karl Deimling
- 👤 Roland Falk
- 👤 Aribert Krug
- 👤 Peter Nagel
- 👤 Rudolf Sand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:34
CPC Classifications
C; C09; C09G; C09G1/00; C09G1/06; C09G1/14; C09G1/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
A process for polishing the surfaces of the ground magnetic coatings of magnetic storage disks, said disks consisting essentially of a rigid substrate provided on both sides with a firmly adhering magnetic coating of a magnetic material finely dispersed in a cured organic binder, which process comprises; pressing a felt ring or felt disk against the surfaces of the magnetic storage disks as they are rotated alternately in opposite directions, said felt ring or felt disk having applied thereto an aqueous emulsion consisting essentially of water, one or more emulsifiers and from 2 to 25% by weight of butyl acetate, based on the weight of the emulsion, and thereafter rinsing the disks to remove the emulsion and any abraded material contained therein.
Claim 2
Dependent Claim
122 words
A process for polishing the surfaces of the ground magnetic coatings of magnetic storage disks, said disks consisting essentially of a rigid substrate provided on both sides with a firmly adhering magnetic coating of a magnetic material finely dispersed in a cured organic binder, which process comprises; pressing a felt ring or felt disk against the surfaces of the magnetic storage disks as they are rotated alternately in opposite directions, said felt ring or felt disk having applied thereto an aqueous emulsion consisting essentially of water, one or more emulsifiers and from 2 to 25% by weight of butyl acetate, based on the weight of the emulsion, and thereafter rinsing the disks to remove the emulsion and any abraded material contained therein.
Claim 3
Dependent Claim
38 words
The process of claim 1, wherein the emulsion consists essentially of 40 to 90% by weight of water, 10 to 60% by weight of one or more emulsifiers and from 2 to 25% by weight of butyl acetate.
Claim 4
Dependent Claim
27 words
The process of claim 1 or 2, wherein the amount of butyl acetate is from 12 to 25% by weight based on the weight of the emulsion.
Claim 5
Dependent Claim
21 words
The process of claim 1 or 2, wherein from 1 to 4% by weight of butane-1,4-diol is added to the emulsion.
References Cited (Backward Citations)
US2913246A
Cited
US3398011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |