US4327140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High density information disc lubricants
Assignee: RCA Corp
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Filing: 1981-02-05
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Granted: 1982-04-27
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Expires: 2001-02-05
Abstract
Abstract High density information discs comprising a conductive carbon loaded polyvinylchloride disc is lubricated with a fractionated methyl alkyl siloxane lubricant which contains an amino alkoxy silane.
Inventors
- 👤 Joseph R. Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:53
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/50; G11B23/505; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31667
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
168 words
In a high density information record adapted for use with a playback stylus to effect recovery of signals occupying a bandwidth of at least several megahertz when relative motion at a desired rate is established between said record and said stylus, said record comprising a disc of a conductive material containing an information track constituted by a surface relief pattern in said track to accommodate recovery of signals of said bandwidth upon establishment of relative motion at said rate, said record coated with a methyl alkyl siloxane lubricant having the formula ##STR2## wherein R 1 and R 2 are alkyl groups of 4-20 carbon atoms, x is an integer of 2-4, y is an integer of 0-2 and wherein the sum of x plus y is 4 or less, the improvement which comprises adding to said lubricant an amino alkoxy silane compound of the formula H.sub.2 N--R.sub.1 --Si(OR.sub.2).sub.3 wherein R 1 is an alkylene group and R 2 is an alkyl group of up to 12 carbon atoms.
Claim 2
Dependent Claim
168 words
In a high density information record adapted for use with a playback stylus to effect recovery of signals occupying a bandwidth of at least several megahertz when relative motion at a desired rate is established between said record and said stylus, said record comprising a disc of a conductive material containing an information track constituted by a surface relief pattern in said track to accommodate recovery of signals of said bandwidth upon establishment of relative motion at said rate, said record coated with a methyl alkyl siloxane lubricant having the formula ##STR2## wherein R 1 and R 2 are alkyl groups of 4-20 carbon atoms, x is an integer of 2-4, y is an integer of 0-2 and wherein the sum of x plus y is 4 or less, the improvement which comprises adding to said lubricant an amino alkoxy silane compound of the formula H.sub.2 N--R.sub.1 --Si(OR.sub.2).sub.3 wherein R 1 is an alkylene group and R 2 is an alkyl group of up to 12 carbon atoms.
Claim 3
Dependent Claim
14 words
A record according to claim 1 wherein x is 2-4 and y is 0.
Claim 4
Dependent Claim
19 words
A record according to claim 1 wherein the amino silane has the formula H.sub.2 N--CH.sub.2 CH.sub.2 CH.sub.2 --Si(OC.sub.2 H.sub.5).sub.3
Claim 5
Dependent Claim
26 words
A record according to claim 1 wherein from about 5 to about 20 percent by weight of the lubricant of the amino alkoxy silane is present.
Claim 6
Dependent Claim
22 words
A record according to claim 1 or 4 wherein said disc is made of a conductive carbon-containing polymer or copolymer of polyvinylchloride.
References Cited (Backward Citations)
US3833408A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-26 | 1985-10-26 | 1986-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-26 | 1989-10-26 | 1990-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-26 | 1993-10-26 | 1994-04-27 | $7700.00 | Window Closed / Lapsed |