US3628994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating a plurality of substrates by vapor deposition
Assignee: RTX Corp
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Filing: 1969-03-13
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Granted: 1971-12-21
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Expires: 1989-03-13
Abstract
Abstract In the processes and method for forming protective coatings on metals, particularly the nickel-base and cobalt-base superalloys, by deposition or vacuum, the positioning of a plurality of substrates of complex geometry in the chamber in a predetermined region of vapor isodensity.
Inventors
- 👤 Sol S Blecherman
- 👤 Nicholas E Ulion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:44
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/50; C23C14/505
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
32 words
The method according to claim 1 including: spacing the axis of the several substrates apart along the vapor isodensity curve to prevent shielding of any area of a substrate from the source.
Claim 2
Independent Claim
209 words
The method of depositing a coating by vacuum deposition from a source of the coating on all sides of a plurality of substrates nonsymmetrical about their longitudinal axis comprising: positioning each of the substrates within a vacuum chamber with theiR longitudinal axis parallel; establishing a moving cloud of coating material vapor within the chamber between the source of the coating and the substrate to be coated; positioning each of the substrates in a predetermined region of vapor isodensity, with opposed substrates on opposite sides of a vertical axis through the cloud having a mirror image symmetry and uniformly spaced from the vertical axis, the region including at least a curved portion defining a zone of constant vapor concentration, the region of isodensity being defined and determined in accordance with a formula as follows: where H coating rate cm./min. Alpha rate of evaporation g./min. Rho density psi angle between substrate normal and direction cosine theta angle between direction of coating and normal to source r distance from, and rotating each of the substrates about its longitudinal axis, each axis being a fixed distance and angle from the source thereby continuously varying the distance and angle of incidence of all the substrate surfaces relative to the source of the coating material.
Claim 3
Dependent Claim
32 words
The method according to claim 3 including: spacing the axis of the several substrates apart along the vapor isodensity curve to prevent shielding of any area of a substrate from the source.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |