US4340629A
Expired / Lapsed
US
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High density information disc
Assignee: RCA Corp
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Filing: 1981-06-12
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Granted: 1982-07-20
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Expires: 2001-06-12
Abstract
Abstract High density information discs comprising a conductive carbon loaded polyvinylchloride disc is lubricated with a fractionated methyl alkyl siloxane lubricant which contains a quinuclidene additive.
Inventors
- 👤 Louis J. Hillenbrand
- 👤 Joseph R. Preston
- 👤 David A. Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:14
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/50; G11B23/505; C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/20; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/2457; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31667
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
151 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 ##STR3## 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 a quinuclidene additive of the formula ##STR4## wherein R is an electron donating group.
Claim 2
Dependent Claim
151 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 ##STR3## 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 a quinuclidene additive of the formula ##STR4## wherein R is an electron donating group.
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
27 words
A record according to claim 1 wherein R is selected from the group consisting of hydrogen, alkyl of 1-5 carbon atoms, Si(CH 3 ) 3 and halogen.
Claim 5
Dependent Claim
13 words
A record according to claim 3 wherein R at each occurrence is hydrogen.
Claim 6
Dependent Claim
25 words
A record according to claim 1 wherein from about 5 to about 20 percent by weight of the lubricant of the quinuclidene additive is present.
Claim 7
Dependent Claim
24 words
A record according to claims 1 or 4 or 5 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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |