US4316281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spacer for stacked recorded discs
Assignee: RCA Corp
•
Filing: 1980-09-22
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Granted: 1982-02-16
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Expires: 2000-09-22
Abstract
Abstract A spacer for use between two adjacent recorded discs in a stack of the discs includes a flat, circular, relatively rigid plate having opposed major surfaces and a hole through the center thereof. The plate has portions around its peripheral edge and the edge of the hole which are thicker than the rest of the plate and project beyond the major surfaces of the plate. The thicker portions of the spacer engage unrecorded surface portions of the adjacent recorded discs so as to space the recorded portions of the adjacent recorded discs from the major surfaces of the spacer plate to prevent dust, dirt and other contaminating particles from being pressed into or against the recorded portions of the recorded discs which may damage the recorded discs.
Inventors
- 👤 John J. Prusak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:00
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
65 words
A spacer for use between two adjacent recorded discs in a stack of said discs comprising a flat circular relatively rigid plate having opposed major surfaces and a hole through the center thereof, said plate having portions around its peripheral edge and the edge of the hole which are thicker than the rest of the plate, with the thicker portions being of substantially uniform thickness.
Claim 2
Dependent Claim
65 words
A spacer for use between two adjacent recorded discs in a stack of said discs comprising a flat circular relatively rigid plate having opposed major surfaces and a hole through the center thereof, said plate having portions around its peripheral edge and the edge of the hole which are thicker than the rest of the plate, with the thicker portions being of substantially uniform thickness.
Claim 3
Dependent Claim
27 words
A spacer in accordance with claim 1 in which each surface of the thicker portions of the plate project beyond the adjacent major surface of the plate.
Claim 4
Dependent Claim
31 words
A spacer in accordance with claim 2 in which the thicker portion around the peripheral edge has a radial width less than that of the thicker portion adjacent the center hole.
Claim 5
Dependent Claim
33 words
A spacer in accordance with claim 2 in which the plate is of a metal and the thicker portions include strips of a plastic material bonded to the major surfaces of the metal.
Claim 6
Dependent Claim
27 words
A spacer in accordance with claim 4 in which the thickness of each of the plastic strips is about equal to the thickness of the metal plate.
Claim 7
Dependent Claim
107 words
In a stack of recorded discs in which each disc has a recorded portion in at least one major surface and unrecorded portions around the periphery of the disc and the edge of a center hole in the disc and a flat, circular, substantially rigid spacer having a pair of opposed major surfaces and a center hole therethrough between two adjacent recorded discs, the improvement comprising: said spacer having portions around its peripheral edge and the edge of the center hole which are thicker than the rest of the spacer with the thicker portions being of uniform thickness and contacting the surfaces of the adjacent recorded discs.
Claim 8
Dependent Claim
107 words
In a stack of recorded discs in which each disc has a recorded portion in at least one major surface and unrecorded portions around the periphery of the disc and the edge of a center hole in the disc and a flat, circular, substantially rigid spacer having a pair of opposed major surfaces and a center hole therethrough between two adjacent recorded discs, the improvement comprising: said spacer having portions around its peripheral edge and the edge of the center hole which are thicker than the rest of the spacer with the thicker portions being of uniform thickness and contacting the surfaces of the adjacent recorded discs.
Claim 9
Dependent Claim
26 words
A stack of recorded discs in accordance with claim 6 in which the thicker portions of the spacer project beyond both major surfaces of the spacer.
Claim 10
Dependent Claim
67 words
A stack of recorded discs in accordance with claim 7 in which the radial width of each of the thicker portions is no greater than the radial width of the adjacent unrecorded portions of the recorded discs so that the thicker portions contact the unrecorded portions of the adjacent unrecorded discs and space the recorded portions of the recorded discs from the major surfaces of the spacer.
Claim 11
Dependent Claim
39 words
A stack of recorded discs in accordance with claim 8 in which the spacer is a plate of a metal and the thicker portions include strips of a plastic material bonded to the major surfaces of the metal plate.
Claim 12
Dependent Claim
30 words
A stack of recorded discs in accordance with claim 9 in which the thickness of each of the plastic strips is about equal to the thickness of the metal plate.
References Cited (Backward Citations)
US1683440A
Cited
US1908940A
Cited
US2906536A
Cited
US3051496A
Cited
US3169023A
Cited
US3360271A
Cited
US3670878A
Cited
US3854729A
Cited
US4021048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-15 | 1985-08-17 | 1986-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-15 | 1989-08-17 | 1990-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-15 | 1993-08-17 | 1994-02-16 | $7700.00 | Window Closed / Lapsed |