US4793792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reproduction mold for forming substrate for recording medium with information signal recorded thereon
Assignee: Canon Inc
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Filing: 1986-11-20
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Granted: 1988-12-27
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Expires: 2006-11-20
Abstract
Abstract In a precision reproducing mold for forming a substrate of a recording medium on which information signals are recored, ions are implanted into a surface bearing precise pattern, of the reproducing mold. A process for producing such mold comprises a step of implanting ions into a surface, bearing precise patterns, of the metal which is electrolytically deposited onto an original plate and then separated therefrom.
Inventors
- 👤 Shoji Akino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:39
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/48; Y; Y10; Y10S; Y10S425/00; Y10S425/81
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A precision recording mold having a surface bearing precise patterns for forming a substrate of a recording medium capable of recording information signals; said mold being principally composed of a material selected from the group consisting of nickel or a mixture of nickel and cobalt, wherein said surface having implanted therein titanium ions and ions selected from the group consisting of phosphorus ions, boron ions, carbon ions, nitrogen ions, oxygen ions and mixtures thereof.
Claim 2
Dependent Claim
74 words
A precision recording mold having a surface bearing precise patterns for forming a substrate of a recording medium capable of recording information signals; said mold being principally composed of a material selected from the group consisting of nickel or a mixture of nickel and cobalt, wherein said surface having implanted therein titanium ions and ions selected from the group consisting of phosphorus ions, boron ions, carbon ions, nitrogen ions, oxygen ions and mixtures thereof.
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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) | 1991-12-27 | 1992-06-27 | 1992-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-27 | 1996-06-27 | 1996-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-27 | 2000-06-27 | 2000-12-27 | $7700.00 | Window Closed / Lapsed |