Patent US4503531A successfully refreshed from Google Patents.
US4503531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical disc
Assignee: Pioneer Corp
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Filing: 1982-12-08
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Granted: 1985-03-05
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Expires: 2002-12-08
Abstract
Abstract An optical disc includes a pair of substrates, at least one of which has predetermined information pits formed on one surface. The two substrates are bonded with a hot-melt adhesive having (1) a softening point of not more than 140° C., (2) a dry tensile adhesive strength of not less than 1 kg/cm 2 at 20° C. and (3) a melt viscosity of not more than 1,000 P at 160° C.
Inventors
- 👤 Hiroshi Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:16
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/12; B32B15/00; B32B15/04; B32B15/08; B32B15/20; B32B3/00; B32B3/26; B32B3/30; G; G11; G11B; G11B7/00; G11B7/24; G11B7/24018; G11B7/24021; G11B7/26; B32B37/00; B32B37/12; B32B37/1207; B32B2037/1215; B32B2311/00; B32B2311/24; B32B2429/00; B32B2429/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31844; Y10T428/31855; Y10T428/31938
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
71 words
An optical disc, comprising: a pair of substrates, at least one of which having predetermined information pits formed on one surface, said two substrates being bonded with a hot-melt adhesive having (1) a softening point of not more than 140° C., (2) a dry tensile adhesive strength of not less than 1 kg/cm 2 at 20° C. and (3) a melt viscosity of not more than 1,000 P at 160° C.
Claim 2
Dependent Claim
71 words
An optical disc, comprising: a pair of substrates, at least one of which having predetermined information pits formed on one surface, said two substrates being bonded with a hot-melt adhesive having (1) a softening point of not more than 140° C., (2) a dry tensile adhesive strength of not less than 1 kg/cm 2 at 20° C. and (3) a melt viscosity of not more than 1,000 P at 160° C.
Claim 3
Dependent Claim
26 words
An optical disc as claimed in claim 1, said adhesive having a base comprising a mixture of one or more block thermoplastic elastomers, and a tackifier.
Claim 4
Dependent Claim
34 words
An optical disc as claimed in claim 2, said tackifier being selected from among natural rosin, polymerized rosin, hydrogenated rosin, rosin esters, aliphatic, alicyclic and aromatic petroleum resins and terpene, phenolic and camarone resins.
Claim 5
Dependent Claim
14 words
An optical disc as claimed in claim 2, said adhesive further including a softener.
Claim 6
Dependent Claim
41 words
A laminated disc, comprising; at least a pair of substrates arranged in confronting relation, and an adhesive bonding said substrates, said adhesive being of a non-solvent type and including a base including at least one block thermoplastic elastomer and a tackifier.
Claim 7
Dependent Claim
41 words
A laminated disc, comprising; at least a pair of substrates arranged in confronting relation, and an adhesive bonding said substrates, said adhesive being of a non-solvent type and including a base including at least one block thermoplastic elastomer and a tackifier.
Claim 8
Dependent Claim
27 words
A laminated disc as claimed in claim 5, said adhesive comprising a hot-melt adhesive having a melt viscosity of not more than 1,000 P at 160° C.
Claim 9
Dependent Claim
37 words
A laminated disc as claimed in claim 6, said adhesive further having a softening point of not more than 140° C. and a dry tensile adhesive strength of not less than 1 kg/cm 2 at 20° C.
References Cited (Backward Citations)
JPS50337A
Cited
US4188433A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-04 | 1988-09-03 | 1989-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-04 | 1992-09-03 | 1993-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-04 | 1996-09-03 | 1997-03-05 | $7700.00 | Window Closed / Lapsed |