US4054500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making refractory metal-ceramic crucible
Assignee: Spectranetics LLC
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Filing: 1975-04-28
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Granted: 1977-10-18
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Expires: 1995-04-28
Abstract
Abstract A crucible for containing metal to be evaporated for vacuum deposition is manufactured by winding refractory metal wire into the shape of a helical basket coil. The coil is electrophoretically coated with a primer coat of alumina and is then flame or plasma sprayed with alumina to form the crucible.
Inventors
- 👤 Edward D. Parent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:12
CPC Classifications
C; C25; C25D; C25D13/00; C25D13/02; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/26; C25D13/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
60 words
A method of making a refractory metal-ceramic crucible comprising the steps of winding refractory metal wire into the shape of a helical basket coil, electrophoretically coating the coil with a primer coat of alumina, firing the primer coat, and flame spraying or plasma spraying sufficient alumina on the primer coated coil to form a crucible capable of containing molten metal.
Claim 2
Independent Claim
60 words
A method of making a refractory metal-ceramic crucible comprising the steps of winding refractory metal wire into the shape of a helical basket coil, electrophoretically coating the coil with a primer coat of alumina, firing the primer coat, and flame spraying or plasma spraying sufficient alumina on the primer coated coil to form a crucible capable of containing molten metal.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the helical basket coil is wound of tungsten wire.
References Cited (Backward Citations)
US2734857A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |