US3889019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor randomization in vacuum deposition of coatings
Assignee: RTX Corp
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Filing: 1971-08-12
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Granted: 1975-06-10
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Expires: 1991-08-12
Abstract
Abstract In the processes for forming protective coatings on metal substrates, particularly the nickel-base and cobalt-base superalloys, by deposition in vacuum, an inert gas leak adjacent the substrate is utilized to randomize the coating vapor cloud and cause non line-of-sight deposition.
Inventors
- 👤 Sol S Blecherman
- 👤 Mitchell J Bala
- 👤 Dennis J Evans
- 👤 Nicholas E Ulion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:31
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
145 words
A PROCESS OF VACUUM VAPOR DEPOSITING A PROTECTIVE METAL COATING ON A METALLIC SUBSTRATE COMPRISING: POSITIONING A SOURCE OF MATERIAL TO BE VAPORIZED WITHIN AN EVACUATED ENCLOSURE; POSITIONING THE SUBSTRATE WITHIN THE ENCLOSURE ABOVE SAID SOURCE IN DIRECT LINE-OF-SIGHT THEREOF SUCH THAT VAPOR PARTICLES PRODUCED BY HEATING SAID SOURCE MATERIAL IMPINGE ON AND COAT LINE-OF-SIGHT PORTIONS OF SAID SUBSTRATE; HEATING SAID SOURCE MATERIAL TO PARODUCE A VAPOR CLOUD OF COATING MATERIAL MOVING GENERAL LINE-OF-SIGHT FROM SAID SOURCE TO SAID SUBSTRATE AND COATING LINE-OF-SIGHT PORTIONS OF THE SUBSTRATE; INTRODUCING A LOW VELOCITY AN INERT GAS TO INCREASE THE PRESSURE IN THE ENCLOSURE TO AT LEAST 2.0 x 10**-4 MM HG TO DECREASE THE MEAN FREE COLLISION PATH OF VAPOR CLOUD ATOMS TO RANDOMIZE THEIR DIRECTION AND CAUSE COATING OF NON-LINE-OF-SIGHT PORTIONS OF SAID SUBSTRATE, SAID PRESSURE BEING SUFFICIENTLY LOW TO PREVENT SUSTAINING A GAS PLASMA DISCHARGE.
Claim 2
Dependent Claim
145 words
A PROCESS OF VACUUM VAPOR DEPOSITING A PROTECTIVE METAL COATING ON A METALLIC SUBSTRATE COMPRISING: POSITIONING A SOURCE OF MATERIAL TO BE VAPORIZED WITHIN AN EVACUATED ENCLOSURE; POSITIONING THE SUBSTRATE WITHIN THE ENCLOSURE ABOVE SAID SOURCE IN DIRECT LINE-OF-SIGHT THEREOF SUCH THAT VAPOR PARTICLES PRODUCED BY HEATING SAID SOURCE MATERIAL IMPINGE ON AND COAT LINE-OF-SIGHT PORTIONS OF SAID SUBSTRATE; HEATING SAID SOURCE MATERIAL TO PARODUCE A VAPOR CLOUD OF COATING MATERIAL MOVING GENERAL LINE-OF-SIGHT FROM SAID SOURCE TO SAID SUBSTRATE AND COATING LINE-OF-SIGHT PORTIONS OF THE SUBSTRATE; INTRODUCING A LOW VELOCITY AN INERT GAS TO INCREASE THE PRESSURE IN THE ENCLOSURE TO AT LEAST 2.0 x 10**-4 MM HG TO DECREASE THE MEAN FREE COLLISION PATH OF VAPOR CLOUD ATOMS TO RANDOMIZE THEIR DIRECTION AND CAUSE COATING OF NON-LINE-OF-SIGHT PORTIONS OF SAID SUBSTRATE, SAID PRESSURE BEING SUFFICIENTLY LOW TO PREVENT SUSTAINING A GAS PLASMA DISCHARGE.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein the inert gas is helium.
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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |