US4408320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spacer for use in testing information recorded discs
Assignee: RCA Corp
•
Filing: 1981-08-24
•
Granted: 1983-10-04
•
Expires: 2001-08-24
Abstract
Abstract A spacer ring for use in stress testing molded information recorded discs. The spacer rings minimize the splattering or dripping of large droplets of water on the discs after the discs have been subjected to high temperature and humidity so as to increase the accuracy of the results of the test.
Inventors
- 👤 Alexander W. Buzgo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:09
CPC Classifications
G; G11; G11B; G11B23/00; Y; Y10; Y10T; Y10T428/00; Y10T428/21; Y10T428/218
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
58 words
A spacer ring for use in testing information recorded discs comprising an unbroken annular substantially flat body having concave top and bottom surfaces and at each of the surfaces at least one passage extending radially inwardly from the outer periphery of the body and at least one passage extending radially outwardly from the inner periphery of the body.
Claim 2
Dependent Claim
58 words
A spacer ring for use in testing information recorded discs comprising an unbroken annular substantially flat body having concave top and bottom surfaces and at each of the surfaces at least one passage extending radially inwardly from the outer periphery of the body and at least one passage extending radially outwardly from the inner periphery of the body.
Claim 3
Dependent Claim
38 words
A spacer ring in accordance with claim 1 in which each of the top and bottom surfaces has a groove therein and extending therealong so as to provide the concave surfaces, and the passages open into the grooves.
Claim 4
Dependent Claim
22 words
A spacer ring in accordance with claim 2 in which the passages are provided by notches in the surfaces of the body.
Claim 5
Dependent Claim
34 words
A spacer ring in accordance with claim 3 including a plurality of the notches in each of the surfaces extending to the groove from each of the outer and inner peripheries of the body.
Claim 6
Dependent Claim
32 words
A spacer ring in accordance with claim 4 in which at each surface each notch extending from the outer periphery is in radial alignment with a notch extending from the inner periphery.
Claim 7
Dependent Claim
20 words
A spacer ring in accordance with claims 1 or 5 in which the spacer ring is of a plastic material.
Claim 8
Dependent Claim
88 words
In an apparatus for testing recorded discs which includes a plurality of said recorded discs stacked on a spindle with a spacer ring on said spindle between each pair of adjacent discs, the improvement comprising each of said spacer rings being an unbroken annular substantially flat body having concave top and bottom surfaces and at each of the surfaces at least one passage extending radially inwardly from the outer periphery of the body and at least one passage extending radially outwardly from the inner periphery of the body.
Claim 9
Dependent Claim
88 words
In an apparatus for testing recorded discs which includes a plurality of said recorded discs stacked on a spindle with a spacer ring on said spindle between each pair of adjacent discs, the improvement comprising each of said spacer rings being an unbroken annular substantially flat body having concave top and bottom surfaces and at each of the surfaces at least one passage extending radially inwardly from the outer periphery of the body and at least one passage extending radially outwardly from the inner periphery of the body.
Claim 10
Dependent Claim
27 words
An apparatus in accordance with claim 7 in which the outer diameter of each of the spacer rings is smaller than the outer diameters of the discs.
Claim 11
Dependent Claim
41 words
An apparatus in accordance with claim 8 in which each of the top and bottom surfaces of each spacer ring has a groove therein and extending therealong so as to provide the concave surfaces, and the passages open into the grooves.
Claim 12
Dependent Claim
27 words
An apparatus in accordance with claim 9 in which the passages in each of the spacer rings are provided by notches in the surface of the body.
Claim 13
Dependent Claim
39 words
An apparatus in accordance with claim 10 in which each of said spacer rings include a plurality of notches in each of the surfaces extending to the grooves from each of the outer and inner peripheries of the body.
Claim 14
Dependent Claim
19 words
An apparatus in accordance with claim 8 in which each of said spacer rings is of a plastic material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |