Patent US4275101A successfully refreshed from Google Patents.
US4275101A
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Video disc lubricants
Assignee: RCA Corp
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Filing: 1979-08-09
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Granted: 1981-06-23
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Expires: 1999-08-09
Abstract
Abstract Molecular distillation of methyl alkyl siloxanes of the formula <IMAGE> wherein R1 and R2 are alkyl groups of 4-20 carbon atoms and m and p are integers to produce a distillate having a molecular weight fraction wherein the sum of m and p is about 4, produces an improved lubricant for the video disc, a lubricant that is stable to long term storage and to wide variations in temperature and relative humidity.
Inventors
- 👤 Chih C. Wang
- 👤 Lincoln Ekstrom
- 👤 Thomas C. Lausman
- 👤 Henry Wielicki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:28
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/20; G; G11; G11B; G11B23/00; G11B23/50; G11B23/505; C10; C10M; C10M2229/00; C10M2229/04; C10M2229/041; C10N; C10N2040/00; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50; C10N2050/00; C10N2050/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
163 words
In a video 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 coating, the improvement which comprises utilizing as said lubricant, a composition of the formula ##STR11## 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 wherein said composition has a distillation range of from about 100°-205° C. at 10 -5 torr and wherein said composition is free of antioxidant.
Claim 2
Dependent Claim
163 words
In a video 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 coating, the improvement which comprises utilizing as said lubricant, a composition of the formula ##STR11## 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 wherein said composition has a distillation range of from about 100°-205° C. at 10 -5 torr and wherein said composition is free of antioxidant.
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
18 words
A record according to claim 1 wherein R 1 and R 2 are alkyl of 4-12 carbon atoms.
Claim 5
Dependent Claim
17 words
A record according to claim 3 wherein R 1 is a decyl group and y is 0.
Claim 6
Dependent Claim
17 words
A record according to claim 1 wherein said methyl alkyl siloxane composition is free of silicon hydrides.
Claim 7
Dependent Claim
116 words
In a recording means comprising a video disc having an information track in a surface thereof, said information track containing information in the form of geometric variations in the surface of said disc, and a uniform lubricant layer disposed on the surface of said disc, the improvement which comprises utilizing as said lubricant a composition of the formula ##STR12## 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, having a distillation range of from about 100°-205° C. at 10 -5 torr wherein said composition is free of antioxidant.
Claim 8
Dependent Claim
116 words
In a recording means comprising a video disc having an information track in a surface thereof, said information track containing information in the form of geometric variations in the surface of said disc, and a uniform lubricant layer disposed on the surface of said disc, the improvement which comprises utilizing as said lubricant a composition of the formula ##STR12## 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, having a distillation range of from about 100°-205° C. at 10 -5 torr wherein said composition is free of antioxidant.
Claim 9
Dependent Claim
15 words
A recording means according to claim 6 wherein said information track is a spiral groove.
Claim 10
Dependent Claim
14 words
A recording means according to claim 6 wherein said disc is a conductive disc.
Claim 11
Dependent Claim
139 words
In an information record comprising a video disc adapted for use with a playback stylus to effect recovery of signals when relative motion as a desired rate is established between said record and said stylus and containing an information track constituted by a surface relief pattern in said track to accommodate recovery of said signals during playback, said record being coated with a lubricant, the improvement which comprises utilizing as said lubricant, a composition of the formula ##STR13## 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, wherein said composition has a distillation range of from about 100°-205° C. at 10 -5 torr and wherein said composition is free of antioxidant.
Claim 12
Dependent Claim
139 words
In an information record comprising a video disc adapted for use with a playback stylus to effect recovery of signals when relative motion as a desired rate is established between said record and said stylus and containing an information track constituted by a surface relief pattern in said track to accommodate recovery of said signals during playback, said record being coated with a lubricant, the improvement which comprises utilizing as said lubricant, a composition of the formula ##STR13## 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, wherein said composition has a distillation range of from about 100°-205° C. at 10 -5 torr and wherein said composition is free of antioxidant.
Claim 13
Dependent Claim
14 words
A record according to claim 9 wherein x is 2-4 and y is 0.
Claim 14
Dependent Claim
11 words
A record according to claim 10 wherein R 1 is decyl.
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) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |