US4443806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data recording medium
Assignee: Toshiba Corp
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Filing: 1981-10-07
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Granted: 1984-04-17
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Expires: 2001-10-07
Abstract
Abstract A data recording medium comprises a pair of disc-shaped substrates opposing each other at a distance; a radiation-sensitive recording layer formed on an opposing surface of each of the substrates; and a protective layer formed on each of the radiation-sensitive recording layers. Optical data may be recorded on the record or may be read out from this record by focusing a laser beam on the recording layer.
Inventors
- 👤 Hideo Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:08
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/24015; G11B7/254; G11B7/257; G11B7/2572; G11B7/2575; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24316
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A data recording medium comprising: a pair of disc-shaped substrates; means for mounting said substrates opposing each other at a distance including a pair of coaxial, ring-shaped spacers of different sizes sealed between the opposing surfaces of said disc shaped substrates coaxially therewith and forming an annular space therebetween; a radiation-sensitive recording layer formed on an opposing surface of each of said substrates; an organic protective layer formed on said recording layer; an inorganic protective layer formed on said organic protective layer, and a reinforcing member arranged within said annular space so as to be slidable relative to said protective layer.
Claim 2
Dependent Claim
101 words
A data recording medium comprising: a pair of disc-shaped substrates; means for mounting said substrates opposing each other at a distance including a pair of coaxial, ring-shaped spacers of different sizes sealed between the opposing surfaces of said disc shaped substrates coaxially therewith and forming an annular space therebetween; a radiation-sensitive recording layer formed on an opposing surface of each of said substrates; an organic protective layer formed on said recording layer; an inorganic protective layer formed on said organic protective layer, and a reinforcing member arranged within said annular space so as to be slidable relative to said protective layer.
Claim 3
Dependent Claim
17 words
A data recording medium according to claim 1, wherein said reinforcing member is made of a metal.
Claim 4
Dependent Claim
26 words
A data recording medium according to claim 1, wherein a space is formed between said ring-shaped outer spacer and an outer periphery of said reinforcing member.
Claim 5
Dependent Claim
20 words
A data recording medium according to claim 1, wherein said substrates have a thickness of 0.1 mm to 2 mm.
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) | 1987-04-17 | 1987-10-17 | 1988-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-17 | 1991-10-17 | 1992-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-17 | 1995-10-17 | 1996-04-17 | $7700.00 | Window Closed / Lapsed |