US3962495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making duplicates of optical or sound recordings
Assignee: RCA Corp
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Filing: 1975-01-02
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Granted: 1976-06-08
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Expires: 1995-01-02
Abstract
Abstract Method of making duplicate copies of information recorded in an organic plastic material as minute surface relief patterns, comprising sensitizing and activating the patterned surface, depositing a thin layer of nickel or cobalt utilizing a room temperature autocatalytic deposition process, backing up the thin metal layer with a heavier electrolytic metal deposit, separating the initial nickel or cobalt surface from the plastic surface and using the metal replica to mold or press duplicate copies in a deformable plastic.
Inventors
- 👤 Nathan Feldstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:56
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/1601; C23C18/1633; C23C18/1646; C23C18/165; C23C18/1653; C23C18/1603; C23C18/1607; C23C18/1608; C23C18/1655; C23C18/1657; C23C18/18; C23C18/20; C23C18/28; C23C18/285; C23C18/30; C23C18/31; C23C18/32; C23C18/34; Y; Y10; Y10S; Y10S425/00; Y10S425/81
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
A method of replicating information recorded as a surface relief pattern on a surface of a synthetic resinous positive photoresist material of the type normally attacked by alkaline media without detectable degradation of the photoresist material, comprising: cleaning said surface, sensitizing and activating said surface to form nuclei of an activating metal thereon, and electrolessly depositing nickel or cobalt on said activated surface by immersing said surface at substantially room temperature in a single aqueous solution containing a nickel or cobalt salt, sodium pyrophosphate, ammonium hydroxide and a reducing agent which is either an amine borane or a hypophosphite salt, said solution having a pH between about 9 and 11.
Claim 2
Independent Claim
110 words
A method of replicating information recorded as a surface relief pattern on a surface of a synthetic resinous positive photoresist material of the type normally attacked by alkaline media without detectable degradation of the photoresist material, comprising: cleaning said surface, sensitizing and activating said surface to form nuclei of an activating metal thereon, and electrolessly depositing nickel or cobalt on said activated surface by immersing said surface at substantially room temperature in a single aqueous solution containing a nickel or cobalt salt, sodium pyrophosphate, ammonium hydroxide and a reducing agent which is either an amine borane or a hypophosphite salt, said solution having a pH between about 9 and 11.
Claim 3
Dependent Claim
13 words
A method according to claim 1 in which nickel and cobalt are co-deposited.
Claim 4
Dependent Claim
16 words
A method according to claim 1 in which said surface pattern is an optical deformation image.
Claim 5
Dependent Claim
16 words
A method according to claim 1 in which said surface relief pattern is a video recording.
Claim 6
Dependent Claim
16 words
A method according to claim 1 in which said surface relief pattern is a phase hologram.
Claim 7
Dependent Claim
16 words
A method according to claim 1 in which said surface relief pattern is a sound recording.
Claim 8
Dependent Claim
25 words
The method of claim 1, wherein said bath contains 8.3 g/l of nickel sulfate, 17 g/l of sodium pyrophosphate and 0.5 g/l of dimethylamine borane.
Claim 9
Dependent Claim
25 words
The method of claim 1, wherein said bath contains 7.1 g/l of nickel chloride, 8.3 g/l of sodium hypophosite, and 17 g/l of sodium pyrophosphate.
Claim 10
Dependent Claim
24 words
The method of claim 1, wherein said bath contains 9.1 g/l of cobalt sulfate, 12 g/l sodium pyrophosphate and 0.3 g/l of dimethylamine borane.
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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |