US4061518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making an article having replicated coating with durable dielectric overcoat
Assignee: Individual
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Filing: 1976-06-10
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Granted: 1977-12-06
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Expires: 1996-06-10
Abstract
Abstract In the method for making an article having a replicated coating with a durable dielectric overcoat. A master is formed having a surface to be replicated formed thereon. A parting compound such as silicon oil is placed on the surface while under a vacuum. An optical coating is formed in reverse order, with the protective coat first and the reflective coat last, on the coated surface while in the vacuum under a low temperature to cause initial curing of the protective coat without reevaporation of the silicon oil. Thereafter, the optical coating on the master is post-cured in air at an elevated temperature to cause final curing and hardening of the protective coat. After the post-curing has been completed, the replicated part, if desired, is transferred to the part to carry the same and is mounted thereon by a sealing plastic.
Inventors
- 👤 Viola F. Burroughs
- 👤 Hasso G. Vahl
- 👤 Harro W. D. Wahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:45
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00865; B29D11/0073
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
In a method for forming replicated optical parts, producing a master having a surface to be replicated formed thereon, depositing in a vacuum a parting agent in the form of a silicon oil on to the surface to form a thin parting layer of the silicon oil, forming a protective coating on the parting layer in a vacuum at a relatively low temperature ranging from approximately 40° to 100° C but at a sufficiently high temperature to cause an initial partial curing of the protective coat, forming an optical coating on the protective coat at a relatively low temperature ranging from approximately 40° to 100° C, and post-curing the part with the coats thereon in air at an elevated temperature in excess of approximately 200° C for a minimum period of time in excess of approximately 4 hours to cause final curing and hardening of the protective coat.
Claim 2
Dependent Claim
148 words
In a method for forming replicated optical parts, producing a master having a surface to be replicated formed thereon, depositing in a vacuum a parting agent in the form of a silicon oil on to the surface to form a thin parting layer of the silicon oil, forming a protective coating on the parting layer in a vacuum at a relatively low temperature ranging from approximately 40° to 100° C but at a sufficiently high temperature to cause an initial partial curing of the protective coat, forming an optical coating on the protective coat at a relatively low temperature ranging from approximately 40° to 100° C, and post-curing the part with the coats thereon in air at an elevated temperature in excess of approximately 200° C for a minimum period of time in excess of approximately 4 hours to cause final curing and hardening of the protective coat.
Claim 3
Dependent Claim
41 words
A method as in claim 1 wherein said post-curing is carried out by first curing at a temperature of approximately 200° C for a period of approximately 2 hours and thereafter carrying out post-curing at an elevated temperature above 300° C.
Claim 4
Dependent Claim
71 words
A method as in claim 1 together with the step of providing a support element having a surface for carrying a replicated optical coating and protective coat formed on the master, bonding the optical coating on the master to said surface of said supporting element and separating the master from the protective coat so that the supporting element is provided with the optical coating and protective coat carried by the master.
Claim 5
Dependent Claim
34 words
A method as in claim 7 wherein the step of bonding the master to the supporting element is carried out by the use of an epoxy and curing the epoxy to form the bond.
Claim 6
Dependent Claim
179 words
In a method for forming replicated optical parts, producing a master having a surface to be replicated formed thereon, depositing by evaporation in a first vacuum chamber on said surface a thin layer of silicon oil to serve as a parting layer, removing the master from the first vacuum chamber and transferring the same to a second vacuum chamber and minimizing the contamination from air during the transfer, forming a protective coat on the surface of the master in the second vacuum chamber at a temperature ranging from approximately 40° C to 100° C to cause an initial partial curing of the protective coat while retaining the silicon oil parting layer intact, forming an optical coating on the protective coat in the second vacuum chamber at a relatively low temperature from approximately 40° C. to 100° C, and post-curing the part with the coats thereon in air at an elevated temperature in excess of approximately 200° C for a minimum period of time in excess of approximately 4 hours to cause final curing and hardening of the protective coat.
Claim 7
Dependent Claim
179 words
In a method for forming replicated optical parts, producing a master having a surface to be replicated formed thereon, depositing by evaporation in a first vacuum chamber on said surface a thin layer of silicon oil to serve as a parting layer, removing the master from the first vacuum chamber and transferring the same to a second vacuum chamber and minimizing the contamination from air during the transfer, forming a protective coat on the surface of the master in the second vacuum chamber at a temperature ranging from approximately 40° C to 100° C to cause an initial partial curing of the protective coat while retaining the silicon oil parting layer intact, forming an optical coating on the protective coat in the second vacuum chamber at a relatively low temperature from approximately 40° C. to 100° C, and post-curing the part with the coats thereon in air at an elevated temperature in excess of approximately 200° C for a minimum period of time in excess of approximately 4 hours to cause final curing and hardening of the protective coat.
Claim 8
Dependent Claim
39 words
A method as in claim 5 wherein the silicon oil is evaporated in the first vacuum chamber by placing it on a filament and then heating the filament to a temperature ranging from approximately 100° C to 300° C.
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) | 1980-12-05 | 1981-06-06 | 1981-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-05 | 1985-06-06 | 1985-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-05 | 1989-06-06 | 1989-12-06 | $7700.00 | Window Closed / Lapsed |