US4216970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video disc lubricants
Assignee: RCA Corp
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Filing: 1979-03-05
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Granted: 1980-08-12
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Expires: 1999-03-05
Abstract
Abstract Siloxanes of the formula <IMAGE> wherein R3 and R3' independently at each occurrence are long chain alkyl groups and m is an integer of 0 or 1, can be employed as lubricants for video discs. The lubricants are stable to long term storage and to wide variations in temperature and humidity.
Inventors
- 👤 Chih C. Wang
- 👤 Lincoln Ekstrom
- 👤 Henry Wielicki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:52
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/68; G11B3/682; C; C10; C10M; C10M2227/00; C10M2227/04; 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; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
In a video disc 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 siloxane lubricant coating from about 150 to 500 angstroms thick, the improvement which comprises utilizing as said lubricant a liquid composition of the formula ##STR7## wherein R 3 and R 3 ' independently at each occurrence are long chain alkyl groups of 10-14 carbon atoms and m is an integer of 0 or 1.
Claim 2
Dependent Claim
138 words
In a video disc 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 siloxane lubricant coating from about 150 to 500 angstroms thick, the improvement which comprises utilizing as said lubricant a liquid composition of the formula ##STR7## wherein R 3 and R 3 ' independently at each occurrence are long chain alkyl groups of 10-14 carbon atoms and m is an integer of 0 or 1.
Claim 3
Dependent Claim
10 words
A record according to claim 1 wherein m is 0.
Claim 4
Dependent Claim
24 words
A record according to claim 2 wherein R 3 and R 3 ' are the same and are alkyl groups of 10-14 carbon atoms.
Claim 5
Dependent Claim
16 words
A record according to claim 3 wherein R 3 and R 3 ' are dodecyl groups.
Claim 6
Dependent Claim
95 words
In a recording means comprising a 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 from about 150 to 500 angstroms thick disposed on the surface of said disc, the improvement which comprises utilizing as said lubricant a liquid composition of the formula ##STR8## wherein R 3 and R 3 ' independently at each occurrence are long chain alkyl groups of 10-14 carbon atoms and m is an integer of 0 or 1.
Claim 7
Dependent Claim
95 words
In a recording means comprising a 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 from about 150 to 500 angstroms thick disposed on the surface of said disc, the improvement which comprises utilizing as said lubricant a liquid composition of the formula ##STR8## wherein R 3 and R 3 ' independently at each occurrence are long chain alkyl groups of 10-14 carbon atoms and m is an integer of 0 or 1.
Claim 8
Dependent Claim
14 words
A recording means according to claim 5 wherein said disc is a conductive disc.
Claim 9
Dependent Claim
113 words
In an information record adapted for use with a playback stylus to effect recovery of signals when relative motion at 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 coating from about 150 to 500 angstroms thick, the improvement which comprises utilizing as said lubricant coating a liquid composition of the formula ##STR9## wherein R 3 and R 3 ' independently at each occurrence are long chain alkyl groups of 10-14 carbon atoms and m is an integer of 0 or 1.
Claim 10
Dependent Claim
113 words
In an information record adapted for use with a playback stylus to effect recovery of signals when relative motion at 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 coating from about 150 to 500 angstroms thick, the improvement which comprises utilizing as said lubricant coating a liquid composition of the formula ##STR9## wherein R 3 and R 3 ' independently at each occurrence are long chain alkyl groups of 10-14 carbon atoms and m is an integer of 0 or 1.
Claim 11
Dependent Claim
13 words
A record according to claim 7 wherein said record is a conductive disc.
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) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |