US4029466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Container for evaporation of metal
Assignee: Denka Co Ltd
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Filing: 1975-08-08
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Granted: 1977-06-14
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Expires: 1995-08-08
Abstract
Abstract Metal is evaporated in a container which comprises an electrically conductive ceramic base whose surface in contact with the molten metal is coated with a film comprising, a main component selected from the group consisting of titanium carbide, zirconium carbide, hafnium carbide, vanadium carbide, niobium carbide, tantalum carbide, chromium carbide, molybdenum carbide, tungsten carbide, tungsten metal, tantalum metal and molybdenum metal.
Inventors
- 👤 Masaji Ishii
- 👤 Akio Mikogami
- 👤 Akira Miyai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:36
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/51; C04B41/5133; C04B41/80; C04B41/81; C04B41/85; C04B41/88; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/243
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
42 words
A container for the evaporation of metal which comrises: an electrically conductive ceramic base whose surface in contact with the molten metal is coated with a film comprising a main component selected from the group consisting of tungsten, tantalum and molybdenum metal.
Claim 2
Dependent Claim
42 words
A container for the evaporation of metal which comrises: an electrically conductive ceramic base whose surface in contact with the molten metal is coated with a film comprising a main component selected from the group consisting of tungsten, tantalum and molybdenum metal.
Claim 3
Dependent Claim
10 words
The container of claim 1, which is a cavity-containing boat.
Claim 4
Dependent Claim
9 words
The container of claim 1, which is a crucible.
Claim 5
Dependent Claim
41 words
The container of claim 1, wherein the electrically conductive ceramic comprises 20 - 95 wt. % of an electrically conductive anticorrosive material and a remainder of an electrically insulating anticorrosive material, and has a specific resistance of 40 - 6000 μΩ-cm.
Claim 6
Dependent Claim
20 words
The container of claim 1, wherein the content of the metal in the coating is more than 30 wt. %
Claim 7
Dependent Claim
16 words
The container of claim 1, wherein the coating has a thickness between 30 - 300 μm.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |