Patent US3945898A successfully refreshed from Google Patents.
US3945898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for coating metal surface with carbon
Assignee: Hitachi Ltd
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Filing: 1973-09-19
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Granted: 1976-03-23
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Expires: 1993-09-19
Abstract
Abstract Uniform and strong carbon film can be formed on a surface of a metal substrate or metallized substrate without damaging optical, thermal and electrical characteristics which are original to carbon surface by electrodepositing the carbon film on the substrate from electrodepositing liquid containing carbon and water soluble electrodepositing resin and then heat treating the carbon film to decompose and release said resin.
Inventors
- 👤 Rokuro Tsuji
- 👤 Toshinori Niwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:20
CPC Classifications
C; C25; C25D; C25D13/00; H; H01; H01J; H01J9/00; H01J9/02; H01J9/14; H01J9/142; H01J9/146
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
77 words
A method for coating a surface of a metal or a metallized body to form a substantially pure carbon coating thereon comprising treating said surface with an aqueous electrodepositing liquid consisting essentially of carbon and at least one water soluble organic resin to form an electrodeposited carbon film on said surface and heat treating said carbon film at a temperature of about 300° to 1,000° C. to substantially completely decompose the organic resin in said carbon film.
Claim 2
Independent Claim
77 words
A method for coating a surface of a metal or a metallized body to form a substantially pure carbon coating thereon comprising treating said surface with an aqueous electrodepositing liquid consisting essentially of carbon and at least one water soluble organic resin to form an electrodeposited carbon film on said surface and heat treating said carbon film at a temperature of about 300° to 1,000° C. to substantially completely decompose the organic resin in said carbon film.
Claim 3
Dependent Claim
27 words
A method according to claim 1, wherein said water soluble organic resin is at least one selected from alkyd resin, acrylic resin, phenol resin and melamine resin.
Claim 4
Dependent Claim
30 words
A method according to claim 1, wherein said electrodepositing liquid comprises 0.4-12% by weight of carbon 1-18% by weight of the water soluble organic resin and the balance of water.
Claim 5
Dependent Claim
34 words
A method according to claim 1, wherein conditions for electrodeposition are as follows: a voltage of 30-250 V (DC), time of 1/10 second - 5 minutes and a thickness of 3 μ -70 μ.
Claim 6
Dependent Claim
19 words
A method according to claim 1, wherein the material to be coated with carbon is molded electron tube part.
Claim 7
Dependent Claim
10 words
Electron tube parts produced by the method of claim 5.
Claim 8
Dependent Claim
25 words
A method according to claim 1, wherein thus obtained metal or metallized body having carbon film is molded into a shape of electron tube part.
Claim 9
Dependent Claim
46 words
A method according to claim 1, wherein said carbon film is heated up to said temperature at a rate lower than about 70°C/min., and further wherein said carbon film is cooled from said temperature after heat treatment at a cooling rate of lower than about 70°C/min.
Claim 10
Dependent Claim
30 words
A method according to claim 8, wherein said electrodepositing liquid comprises 0.4-12% by weight of carbon, 1-18% by weight of the water soluble organic resin and the balance of water.
Claim 11
Dependent Claim
8 words
The product of the process of claim 9.
Claim 12
Dependent Claim
21 words
A method according to claim 9, wherein the surface of a molded electron tube part is coated with said carbon film.
Claim 13
Dependent Claim
8 words
The product of the process of claim 11.
Claim 14
Dependent Claim
25 words
A method according to claim 8, wherein the electrodepositing liquid applied to said surface is dried to form said carbon film prior to heat treatment.
Claim 15
Dependent Claim
14 words
A method according to claim 13, wherein said electrodepositing liquid is dried by heating.
Claim 16
Dependent Claim
29 words
A method according to claim 8, wherein sufficient electrodepositing liquid is applied to said surface so that the thickness of said carbon film is about 3μ to about 70μ.
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) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |