Patent US4882827A successfully refreshed from Google Patents.
US4882827A
Expired / Lapsed
US
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Process for producing glass mold
Assignee: Hoya Corp
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Filing: 1988-09-15
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Granted: 1989-11-28
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Expires: 2008-09-15
Abstract
Abstract According to the present process for producing a glass mold, a base for a glass mold to be produced is subjected to a sputtering treatment using an inert gas and graphite as a target at a mold base temperature of 250°-450° C., and thereby is formed on the mold base a hard carbon film having excellent adhesion to the mold base and excellent hardness and being unliable to cause fusion bonding to a molded glass article produced. Accordingly, the glass mold produced according to the present process has excellent durability and excellent glass releasability.
Inventors
- 👤 Yasuo Kusumi
- 👤 Ken Uno
- 👤 Takuo Fujino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:49
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/0605; C03; C03B; C03B11/00; C03B11/06; C03B11/08; C03B11/084; C03B11/086; C03B40/00; C23C14/02; C23C14/024; C03B2215/00; C03B2215/02; C03B2215/08; C03B2215/10; C03B2215/12; C03B2215/14; C03B2215/24; C03B2215/30; C03B2215/34; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A process for producing a glass mold, said process comprising the steps of: (a) processing a material for a base having a surface for a glass mold to be produced into a mold base having a shape corresponding to that of a molded glass article to be produced from the mold; (b) forming a β-SiC having (111) plane orientation on the surface of the mold base according to a chemical vapor deposition (CVD) method; and (c) forming a hard carbon film on the mold base according to a sputtering method using an inert gas and graphite as a target at a mold base temperature of 250°-450° C.
Claim 2
Dependent Claim
107 words
A process for producing a glass mold, said process comprising the steps of: (a) processing a material for a base having a surface for a glass mold to be produced into a mold base having a shape corresponding to that of a molded glass article to be produced from the mold; (b) forming a β-SiC having (111) plane orientation on the surface of the mold base according to a chemical vapor deposition (CVD) method; and (c) forming a hard carbon film on the mold base according to a sputtering method using an inert gas and graphite as a target at a mold base temperature of 250°-450° C.
Claim 3
Dependent Claim
14 words
A process according to claim 1, wherein the mold base material is sintered SiC.
Claim 4
Dependent Claim
13 words
A process according to claim 1, wherein the inert gas is argon gas.
Claim 5
Dependent Claim
42 words
A process according to claim 1, wherein a hard carbon film of different type and different property is obtained by changing an angle formed by the movement direction of carbon atoms sputtered from, the target and the surface of the mold base.
Claim 6
Dependent Claim
35 words
A process according to claim 4, wherein sputtered carbon atoms are deposited on the mold base surface at an angle of 40°-140° to obtain a hard carbon film consisting of diamond-like and graphite-like ultrafine particles.
Claim 7
Dependent Claim
34 words
A process according to claim 4, wherein sputtered carbon atoms are deposited on the mold base surface at an angle of 0°-40° or 140°-180° to obtain a hard carbon film consisting mainly of graphite.
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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) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |