US2996410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating
Assignee: National Steel Corp
•
Filing: 1957-11-25
•
Granted: 1961-08-15
•
Expires: 1977-11-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Milo P Hnilicka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:21
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/56; C23C14/562
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A METHOD FOR COATING A SUBSTRATE IN A VACUUM COATING SYSTEM WHICH COMPRISES MAINTAINING AN ATMOSPHERE CONSISTING PREDOMINANTLY OF A CONDENSIBLE VAPOR IN AN END CHAMBER WITH AT LEAST ONE PASSAGE LEADING TO THE ATMOSPHERE, MAINTAINING A SECOND CHAMBER AT A LOWER PRESSURE THAN THE END CHAMBER BY CONDENSING THE MAJORITY OF THE MASS OF CONDENSIBLE VAPORS LEAKING INTO SAID SECOND CHAMBER THROUGH AT LEAST ONE RESTRICTED PASSAGE BETWEEN SAID END CHAMBER AND SAID SECOND CHAMBER, MAINTAINING A THIRD CHAMBER AT A LOWER PRESSURE THAN THE SECOND CHAMBER, SAID THIRD CHAMBER BEING IN COMMUNICATION BY AT LEAST ONE RESTRICTED PASSAGE WITH SAID SECOND CHAMBER, PASSING SAID SUBSTRATE THROUGH SAID PASSAGES AND CHAMBERS, VACUUM COATING THE SUBSTRATE WHILE UNDER HIGH VACUUM, AND MAINTAINING THE TEMPERATURE OF THE SUBSTRATE WHILE PASSING THROUGH SAID CHAMBERS ABOVE THE CONDENSATION TEMPERATURE OF THE CONDENSIBLE VAPOR.
Claim 2
Independent Claim
140 words
A METHOD FOR COATING A SUBSTRATE IN A VACUUM COATING SYSTEM WHICH COMPRISES MAINTAINING AN ATMOSPHERE CONSISTING PREDOMINANTLY OF A CONDENSIBLE VAPOR IN AN END CHAMBER WITH AT LEAST ONE PASSAGE LEADING TO THE ATMOSPHERE, MAINTAINING A SECOND CHAMBER AT A LOWER PRESSURE THAN THE END CHAMBER BY CONDENSING THE MAJORITY OF THE MASS OF CONDENSIBLE VAPORS LEAKING INTO SAID SECOND CHAMBER THROUGH AT LEAST ONE RESTRICTED PASSAGE BETWEEN SAID END CHAMBER AND SAID SECOND CHAMBER, MAINTAINING A THIRD CHAMBER AT A LOWER PRESSURE THAN THE SECOND CHAMBER, SAID THIRD CHAMBER BEING IN COMMUNICATION BY AT LEAST ONE RESTRICTED PASSAGE WITH SAID SECOND CHAMBER, PASSING SAID SUBSTRATE THROUGH SAID PASSAGES AND CHAMBERS, VACUUM COATING THE SUBSTRATE WHILE UNDER HIGH VACUUM, AND MAINTAINING THE TEMPERATURE OF THE SUBSTRATE WHILE PASSING THROUGH SAID CHAMBERS ABOVE THE CONDENSATION TEMPERATURE OF THE CONDENSIBLE VAPOR.
References Cited (Backward Citations)
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US2239770A
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US2382432A
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US2384500A
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US2562182A
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US2812270A
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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) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |