US4171388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording and storage device having high abrasion resistance and method
Assignee: Corning Glass Works
•
Filing: 1977-12-08
•
Granted: 1979-10-16
•
Expires: 1997-12-08
Abstract
Abstract A magnetic recording and storage device having high wear resistance is produced by providing a magnetic recording and storage device having a film of solid magnetic material which has been bonded to a surface of a rigid substrate. A thin film of a lubricating compound is then applied to the film of magnetic material.
Inventors
- 👤 Richard E. Allen
- 👤 Peter R. Segatto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:07
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/65; G11B5/658; G11B5/68; G11B5/70; G11B5/71; G11B5/72; G11B5/725; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
146 words
The method for producing an abrasion and wear resistant magnetic recording and storage device comprising the steps of providing a magnetic recording and storage device, said device having a solid magnetic film chemically bonded to a substrate, said solid magnetic film being a material selected from the group consisting of magnetite, gamma ferric oxide, cobalt in combination with magnetite, and cobalt in combination with gamma ferric oxide, applying a film of an organic lubricating material over the surface of said magnetic film, said organic lubricating material selected from the group consisting of a silicone based chlorosilane, polyethylene, polyoxyethylene monostearate, morpholino stearate, triethanolamine stearate and mixtures thereof, and removing any excess lubricating material from the surface of the magnetic film by polishing said film of lubricating material such that a film of less than 5000 A of lubricating material remains on the surface of said magnetic film.
Claim 2
Independent Claim
146 words
The method for producing an abrasion and wear resistant magnetic recording and storage device comprising the steps of providing a magnetic recording and storage device, said device having a solid magnetic film chemically bonded to a substrate, said solid magnetic film being a material selected from the group consisting of magnetite, gamma ferric oxide, cobalt in combination with magnetite, and cobalt in combination with gamma ferric oxide, applying a film of an organic lubricating material over the surface of said magnetic film, said organic lubricating material selected from the group consisting of a silicone based chlorosilane, polyethylene, polyoxyethylene monostearate, morpholino stearate, triethanolamine stearate and mixtures thereof, and removing any excess lubricating material from the surface of the magnetic film by polishing said film of lubricating material such that a film of less than 5000 A of lubricating material remains on the surface of said magnetic film.
Claim 3
Dependent Claim
22 words
The method of claim 1 further comprising heating said device to approximately 80° C. prior to applying said film of lubricating material.
Claim 4
Independent Claim
143 words
A method for producing an abrasion and wear resistant magnetic recording and storage device comprising the steps of providing a magnetic recording and storage device, said device having a magnetic film chemically bonded to a substrate, said magnetic film being a material selected from the group consisting of magnetite, gamma ferric oxide, cobalt in combination with magnetite, and cobalt in combination with gamma ferric oxide, applying a film of lubricating material over the surface of said magnetic film by spraying the surface of said magnetic film with said lubricating material, said lubricating material consisting essentially of a 0.1% aqueous solution of polyoxyethylene monostearate, and removing any excess lubricating material from the surface of said magnetic film by polishing said film of lubricating material such that a film of less than 5000 A of lubricating material remains on the surface of said magnetic film.
Claim 5
Independent Claim
143 words
A method for producing an abrasion and wear resistant magnetic recording and storage device comprising the steps of providing a magnetic recording and storage device, said device having a magnetic film chemically bonded to a substrate, said magnetic film being a material selected from the group consisting of magnetite, gamma ferric oxide, cobalt in combination with magnetite, and cobalt in combination with gamma ferric oxide, applying a film of lubricating material over the surface of said magnetic film by spraying the surface of said magnetic film with said lubricating material, said lubricating material consisting essentially of a 0.1% aqueous solution of polyoxyethylene monostearate, and removing any excess lubricating material from the surface of said magnetic film by polishing said film of lubricating material such that a film of less than 5000 A of lubricating material remains on the surface of said magnetic film.
Claim 6
Dependent Claim
22 words
The method of claim 3 further comprising heating said device to approximately 80° C. prior to applying said film of lubricating material.
Claim 7
Independent Claim
161 words
A method for producing an abrasion and wear resistant magnetic recording and storage device comprising the steps of providing a magnetic recording and storage device, said device having a magnetic film chemically bonded to a substrate, said magnetic film selected from the group consisting of magnetite, gamma ferric oxide, cobalt in combination with magnetite, and cobalt in combination with gamma ferric oxide, applying a film of lubricating material over the surface of said magnetic film by spraying the surface of said magnetic film with said lubricating material, said lubricating material consisting essentially of an aqueous emulsion of about 0.05% polyethylene having a molecular weight of about 2500, and about 0.025% polyoxyethylene monostearate containing about 40 moles of polyoxyethylene per mole stearate, and removing any excess lubricating material from the surface of said magnetic film by polishing said film of lubricating material such that a film of less than 5000 A of lubricating material remains on the surface of said magnetic film.
Claim 8
Independent Claim
161 words
A method for producing an abrasion and wear resistant magnetic recording and storage device comprising the steps of providing a magnetic recording and storage device, said device having a magnetic film chemically bonded to a substrate, said magnetic film selected from the group consisting of magnetite, gamma ferric oxide, cobalt in combination with magnetite, and cobalt in combination with gamma ferric oxide, applying a film of lubricating material over the surface of said magnetic film by spraying the surface of said magnetic film with said lubricating material, said lubricating material consisting essentially of an aqueous emulsion of about 0.05% polyethylene having a molecular weight of about 2500, and about 0.025% polyoxyethylene monostearate containing about 40 moles of polyoxyethylene per mole stearate, and removing any excess lubricating material from the surface of said magnetic film by polishing said film of lubricating material such that a film of less than 5000 A of lubricating material remains on the surface of said magnetic film.
Claim 9
Dependent Claim
22 words
The method of claim 5 further comprising heating said device to approximately 80° C. prior to applying said film of lubricating material.
Claim 10
Independent Claim
80 words
A method for producing an abrasion and wear resistant magnetic recording and storage device comprising the steps of providing a magnetic recording and storage device having a solid magnetic film chemically bonded to a substrate, heating said magnetic recording and storage device, and thereafter applying a lubricating film directly to the surface of said magnetic film, said lubricating material being selected from the group consisting of a silicone based chlorosilane, polyethylene, polyoxyethylene monostearate, morpholino stearate, triethanolamine stearate and mixtures thereof.
Claim 11
Independent Claim
80 words
A method for producing an abrasion and wear resistant magnetic recording and storage device comprising the steps of providing a magnetic recording and storage device having a solid magnetic film chemically bonded to a substrate, heating said magnetic recording and storage device, and thereafter applying a lubricating film directly to the surface of said magnetic film, said lubricating material being selected from the group consisting of a silicone based chlorosilane, polyethylene, polyoxyethylene monostearate, morpholino stearate, triethanolamine stearate and mixtures thereof.
Claim 12
Dependent Claim
33 words
The method of claim 7 wherein said lubricating material contains at least one constituent selected from the group consisting of coloring agents, dispersion agents, emulsifying agents, stabilizers, bactericides, mold inhibitors, and combinations thereof.
Claim 13
Dependent Claim
24 words
The method of claim 7 further comprising removing any lubricating film material in excess of 5000 A from the surface of said magnetic film.
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) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |