US2643201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating method and apparatus therefor
Assignee: National Research Corp
•
Filing: 1949-12-24
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Granted: 1953-06-23
•
Expires: 1969-12-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Earl E Chadsey
- 👤 Philip J Clough
- 👤 Nd Philip Godley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:26
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
IN A PROCESS FOR THE COATING OF A SUBSTRATE WITH ALUMINUM BY THE VAPOR DEPOSITION OF ALUMINUM IN A VACUUM CHAMBER WHEREIN THE ALUMINUM IS EVAPORATED FROM A CARBONACEOUS CRUCIBLE WHICH IS FORMED OF ELEMENTAL CARBON SELECTED FROM THE GROUP CONSISTING OF AMORPHOUS CARBON, GRAPHITE AND MIXTURES THEREOF, THE IMPROVEMENT WHICH COMPRISES HEATING THE CRUCIBLE AND THE MOLTEN ALUMINUM THEREIN TO A TEMPERATURE ABOVE ABOUT 1200* C. SO THAT THE VAPOR PRESSURE OF THE ALUMINUM IS ABOVE THE FREE AIR PRESSURE IN THE VACUUM CHAMBER WHILE SUPPLYING INDUCED HEATING CURRENT TO THE CRUCIBLE AND THE ALUMINUM THEREIN MAINTAINING SAID INDUCED HEATING CURRENT AT A FREQUENCY BE TWEEN ABOUT 9600 AND 150,000 CYCLES PER SECOND, SAID FREQUENCY AND THE CRUCIBLE WALL THICKNESS BEING SO RELATED THAT THE SKIN DEPTH OF THE INDUCED CURRENT IS SUBSTANTIALLY GREATER THAN THE
Claim 2
Dependent Claim
137 words
IN A PROCESS FOR THE COATING OF A SUBSTRATE WITH ALUMINUM BY THE VAPOR DEPOSITION OF ALUMINUM IN A VACUUM CHAMBER WHEREIN THE ALUMINUM IS EVAPORATED FROM A CARBONACEOUS CRUCIBLE WHICH IS FORMED OF ELEMENTAL CARBON SELECTED FROM THE GROUP CONSISTING OF AMORPHOUS CARBON, GRAPHITE AND MIXTURES THEREOF, THE IMPROVEMENT WHICH COMPRISES HEATING THE CRUCIBLE AND THE MOLTEN ALUMINUM THEREIN TO A TEMPERATURE ABOVE ABOUT 1200* C. SO THAT THE VAPOR PRESSURE OF THE ALUMINUM IS ABOVE THE FREE AIR PRESSURE IN THE VACUUM CHAMBER WHILE SUPPLYING INDUCED HEATING CURRENT TO THE CRUCIBLE AND THE ALUMINUM THEREIN MAINTAINING SAID INDUCED HEATING CURRENT AT A FREQUENCY BE TWEEN ABOUT 9600 AND 150,000 CYCLES PER SECOND, SAID FREQUENCY AND THE CRUCIBLE WALL THICKNESS BEING SO RELATED THAT THE SKIN DEPTH OF THE INDUCED CURRENT IS SUBSTANTIALLY GREATER THAN THE
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |