US4319252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical data storage and recording medium having a replaceable protective coverplate
Assignee: LaserCard Corp
•
Filing: 1980-07-21
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Granted: 1982-03-09
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Expires: 2000-07-21
Abstract
Abstract A protective removable coverplate for a reflective optical data storage and recording medium wherein a transparent coverplate is removably disposed over a transparent coating which is in intimate contact with the reflective medium. A slightly bumpy upper surface of the coating supports the coverplate with air gaps existing between the coating and the coverplate to a maximum depth of one micron under hand pressure on the coverplate.
Inventors
- 👤 Jerome Drexler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:49
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/162
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A reflective data storage and recording medium comprising, a reflective data surface having transparent coating in intimate contact with the data surface, the coating having a thickness in the range of 1.5 to 15 microns and a slightly bumpy upper surface contacting a transparent coverplate, said bumpy upper surface defining air gaps relative to the coverplate over at least 50% of the upper surface, said air gaps having a maximum depth of one micron under hand pressure on the coverplate.
Claim 2
Dependent Claim
80 words
A reflective data storage and recording medium comprising, a reflective data surface having transparent coating in intimate contact with the data surface, the coating having a thickness in the range of 1.5 to 15 microns and a slightly bumpy upper surface contacting a transparent coverplate, said bumpy upper surface defining air gaps relative to the coverplate over at least 50% of the upper surface, said air gaps having a maximum depth of one micron under hand pressure on the coverplate.
Claim 3
Dependent Claim
30 words
The reflective data storage and recording medium of claim 1 wherein said transparent coating is selected from the group consisting of gelatin, polyvinyl alcohol and partial esters of polyvinyl alcohol.
Claim 4
Dependent Claim
30 words
The reflective data storage and recording medium of claim 1 wherein said transparent coating is selected from the group consisting of polyvinylpyrrolidene, acrylamide-maleic acid mixtures, polyamide-acid mixtures and acrylamide-acrylic acid.
Claim 5
Dependent Claim
18 words
The reflective data storage and recording medium of claim 1 wherein said transparent coating is Transene Photomask Coating-2060.
Claim 6
Dependent Claim
17 words
The reflective data storage and recording medium of claim 1 wherein said transparent coating is a silicone.
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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) | 1985-03-08 | 1985-09-07 | 1986-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-08 | 1989-09-07 | 1990-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-08 | 1993-09-07 | 1994-03-09 | $7700.00 | Window Closed / Lapsed |