US4199480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically conductive boat for vacuum evaporation of metals
Assignee: GTE Sylvania Inc
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Filing: 1978-05-25
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Granted: 1980-04-22
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Expires: 1998-05-25
Abstract
Abstract An electrically conductive boat for the vacuum evaporation of metals comprises a refractory composition consisting essentially of a conductor of titanium diboride and/or zirconium diboride, a coconductor of silicon carbide and an insulator of boron nitride.
Inventors
- 👤 Edward D. Parent
- 👤 Thomas B. McDonough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:08
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/5805; C04B35/58064; C04B35/58078; C04B35/58071; C04B35/622; C04B35/64; C04B35/645; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
An electrically conductive boat for the vacuum evaporation of metals comprising a refractory composition consisting essentially of a conductor of titanium diboride and/or zirconium diboride, a coconductor of silicon carbide, and an insulator of boron nitride, the weight percent of the conductor is about 35% to 60% and the weight percent of the silicon carbide is about 15% to 35%, the balance being boron nitride.
Claim 2
Dependent Claim
65 words
An electrically conductive boat for the vacuum evaporation of metals comprising a refractory composition consisting essentially of a conductor of titanium diboride and/or zirconium diboride, a coconductor of silicon carbide, and an insulator of boron nitride, the weight percent of the conductor is about 35% to 60% and the weight percent of the silicon carbide is about 15% to 35%, the balance being boron nitride.
Claim 3
Dependent Claim
15 words
The boat of claim 1 wherein the composition includes a small amount of flux material.
Claim 4
Dependent Claim
32 words
The boat of claim 1 wherein the composition comprises about 50% by weight of titanium diboride, about 19.7% of silicon carbide, about 28.6% of boron nitride and about 1.7% of boric oxide.
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) | 1983-04-22 | 1983-10-22 | 1984-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-22 | 1987-10-22 | 1988-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-22 | 1991-10-22 | 1992-04-22 | $7700.00 | Window Closed / Lapsed |