Patent US4351048A successfully refreshed from Google Patents.
US4351048A
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High density information disc lubricants
Assignee: RCA Corp
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Filing: 1981-08-27
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Granted: 1982-09-21
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Expires: 2001-08-27
Abstract
Abstract High density information discs are lubricated with a silyl quaternary ammonium salt of the formula <IMAGE> wherein R is a lower alkyl group of 1-5 carbon atoms; R3 is methyl or ethyl; R4 is an alkyl group of 1-12 carbon atoms and X is -OSO2-(CH2)nCH3 wherein n is an integer of 5-12. Discs lubricated with this lubricant exhibit improved stability to high temperature, high relative humidity environments.
Inventors
- 👤 David A. Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:35
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/68; G11B3/682; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24521; Y10T428/30; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31667
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
147 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 compising 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 lubricant, the improvement comprising employing as said lubricant a silyl quaternary ammonium salt lubricant having the formula ##STR5## wherein R is a lower alkyl group of 1-5 carbon atoms; R 3 is methyl or ethyl; R 4 is an alkyl group of 1-12 carbon atoms and X is --OSO 2 --(CH 2 ) n CH 3 wherein n is an integer of 5-12.
Claim 2
Dependent Claim
147 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 compising 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 lubricant, the improvement comprising employing as said lubricant a silyl quaternary ammonium salt lubricant having the formula ##STR5## wherein R is a lower alkyl group of 1-5 carbon atoms; R 3 is methyl or ethyl; R 4 is an alkyl group of 1-12 carbon atoms and X is --OSO 2 --(CH 2 ) n CH 3 wherein n is an integer of 5-12.
Claim 3
Dependent Claim
17 words
A record according to claim 1 wherein said silyl quaternary ammonium salt lubricant has the formula ##STR6##
Claim 4
Dependent Claim
18 words
A record according to claim 1 or 2 wherein said disc is made from a carbon-loaded polyvinylchloride composition.
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) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |