Patent US5048745A successfully refreshed from Google Patents.
US5048745A
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Roll stamper for molding substrate used for optical recording medium, process for preparing same, and process for preparing optical recording medium making use of it
Assignee: Canon Inc
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Filing: 1990-04-26
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Granted: 1991-09-17
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Expires: 2010-04-26
Abstract
Abstract A roll stamper for continuously preparing a substrate used for optical recording mediums, having a convexity and concavity preformat pattern, is prepared by a process comprising the steps of forming a low-melting metal layer on a roll substrate, and forming an auxiliary layer comprising a material different from that of a stamper, on the back of the stamper having on its surface a pattern corresponding with a convexity and concavity preformat pattern. The stamper is overlaid on the roll substrate in such a manner that the low-melting metal layer comes into contact with the auxiliary layer, and thereafter the low-melting metal layer is melted so that the stamper is fixed to the roll substrate.
Inventors
- 👤 Tetsuya Sato
- 👤 Osamu Kanome
- 👤 Masataka Yashima
- 👤 Hiroyuki Sugata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:34
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/42; B29C33/424; B29C33/38; B29C33/3842; B29C43/00; B29C43/32; B29C43/44; B29C43/46; B29C59/00; B29C59/002; B29C59/02; B29C59/04; B29D; B29D17/00; B29D17/005; B29D17/007; B29L; B29L2017/00; B29L2017/001; B29L2017/003; G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; G11B7/263; Y; Y10; Y10S; Y10S425/00; Y10S425/81
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
122 words
A process for preparing a roll stamper for continuously preparing a substrate used for optical recording mediums, having a convexity and concavity preformat pattern, wherein said process for preparing a roll stamper comprises the steps of; forming a low-melting metal layer on a roll substrate; forming an auxiliary layer 16 on the back surface of a stamper having on its front a pattern corresponding with a convexity and concavity preformat pattern, with the auxiliary layer comprising a material different from the stamper; overlaying the stamper on the roll substrate in such a manner that the low-melting metal layer comes into contact with the auxiliary layer; and thereafter melting the low-melting metal layer so that the stamper is fixed to the roll substrate.
Claim 2
Dependent Claim
122 words
A process for preparing a roll stamper for continuously preparing a substrate used for optical recording mediums, having a convexity and concavity preformat pattern, wherein said process for preparing a roll stamper comprises the steps of; forming a low-melting metal layer on a roll substrate; forming an auxiliary layer 16 on the back surface of a stamper having on its front a pattern corresponding with a convexity and concavity preformat pattern, with the auxiliary layer comprising a material different from the stamper; overlaying the stamper on the roll substrate in such a manner that the low-melting metal layer comes into contact with the auxiliary layer; and thereafter melting the low-melting metal layer so that the stamper is fixed to the roll substrate.
Claim 3
Dependent Claim
52 words
A process for preparing a roll stamper according to claim 1, wherein the low-melting metal layer is melted by heating it to a temperature higher than the melting point thereof, using a heated roll which is rolled under pressure against the stamper so that the stamper is fixed to the roll substrate.
References Cited (Backward Citations)
US4408319A
Cited
US4565772A
Cited
US4845000A
Cited
JPS59171003A
Cited
JPS59180801A
Cited
JPS59186154A
Cited
JPS59193560A
Cited
JPS60182532A
Cited
US4968370A
Cited
US4836874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-16 | 1995-03-18 | 1995-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-16 | 1999-03-18 | 1999-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-16 | 2003-03-18 | 2003-09-17 | $7700.00 | Window Closed / Lapsed |