US4025338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for machining metal work
Assignee: Fujifilm Holdings Corp
•
Filing: 1975-09-02
•
Granted: 1977-05-24
•
Expires: 1995-09-02
Abstract
Abstract A process for machining metal work comprising forming a marked-off image from an image-forming material on a surface of a metal work or on a recording layer provided on the surface of the metal work and subsequently machining the metal work by machine cutting and/or oil immersion electrospark machining on the basis of the marked-off image, and including applying a protective resin layer on the image-bearing surface of the metal work prior to any metal machining, the resin layer comprising a mixture of nitrocellulose and a methacrylic polymer in a weight ratio ranging from about 80:20 to 40:60 of the nitrocellulose to the methacrylic polymer and not hindering the viewing of the image, and the methacrylic polymer mainly comprising methyl methacrylate and having a glass transition temperature of higher than about 85° C.
Inventors
- 👤 Hajime Miyatuka
- 👤 Satoru Honjo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:34
CPC Classifications
B; B23; B23P; B23P13/00; B23H; B23H9/00; B23H9/06; C; C09; C09D; C09D5/00; C09D5/008; G; G03; G03G; G03G13/00; G03G13/22; G03G7/00; G03G8/00; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/30084; Y10T409/30112
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
174 words
In an electrophotographic process for machining a metal work comprising forming a marked-off image from an image-forming material on a surface of a recording layer comprising an electrophotographic sensitive layer comprising a photoconductive powder in a binder resin provided on the surface of the metal work and subsequently machining the metal work on the basis of the marked-off image; the improvement comprising applying a protective resin layer over the image-bearing surface of the metal work prior to any metal machining, the resin layer comprising a mixture of nitrocellulose and a methacrylic polymer in a weight ratio ranging from about 80:20 to 40:60 of the nitrocellulose to the methacrylic polymer and not hindering the visibility of the image, and the methacrylic polymer mainly comprising methyl methacrylate, wherein the degree of copolymerization of any other component with methyl methacrylate is up to about 20%, and having a glass transition temperature of about 85° C. to 115° C., wherein said protective resin layer has a thickness ranging from about 2 to 30 microns, on a dry basis.
Claim 2
Dependent Claim
174 words
In an electrophotographic process for machining a metal work comprising forming a marked-off image from an image-forming material on a surface of a recording layer comprising an electrophotographic sensitive layer comprising a photoconductive powder in a binder resin provided on the surface of the metal work and subsequently machining the metal work on the basis of the marked-off image; the improvement comprising applying a protective resin layer over the image-bearing surface of the metal work prior to any metal machining, the resin layer comprising a mixture of nitrocellulose and a methacrylic polymer in a weight ratio ranging from about 80:20 to 40:60 of the nitrocellulose to the methacrylic polymer and not hindering the visibility of the image, and the methacrylic polymer mainly comprising methyl methacrylate, wherein the degree of copolymerization of any other component with methyl methacrylate is up to about 20%, and having a glass transition temperature of about 85° C. to 115° C., wherein said protective resin layer has a thickness ranging from about 2 to 30 microns, on a dry basis.
Claim 3
Dependent Claim
21 words
The process of claim 1, wherein said methacrylic polymer mainly comprises methyl methacrylate and a monomer copolymerizable with said methyl methacrylate.
Claim 4
Dependent Claim
30 words
The process of claim 2, wherein said monomer copolymerizable with said methyl methacrylate is hydroxymethyl methacrylate, hydroxyethyl acrylate, glycidyl methacrylate, vinyl acetate, ethyl methacrylate, acrylic acid, methacrylic acid or styrene.
Claim 5
Dependent Claim
17 words
The process of claim 1, wherein said subsequent machining of said metal work is by machine cutting.
Claim 6
Dependent Claim
19 words
The process of claim 1, wherein said subsequent machining of said metal work is by oil immersion electrospark machining.
Claim 7
Dependent Claim
22 words
The process of claim 1, wherein said subsequent machining of said metal work is by machine cutting and oil immersion electrospark machining.
References Cited (Backward Citations)
US732154A
Cited
US3061708A
Cited
GB1010309A
Cited
GB1070785A
Cited
US3588430A
Cited
US3669859A
Cited
US3648013A
Cited
US3813267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |