US2998376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-vacuum evaporator
Assignee: Temescal Metallurgical Corp
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Filing: 1956-10-29
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Granted: 1961-08-29
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Expires: 1976-10-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Hugh R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:21
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/10; C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/28; C23C14/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
121 words
HIGH-VACUUM EVAPORATING APPARATUS COMPRISING AN OPEN-TOPPED CRUCIBLE FOR HOLDING A SUBSTANCE TO BE EVAPORATED, A FIRST ELECTRON BOMBARDMENT MEANS FOR HEATING SAID CRUCIBLE FROM BELOW TO PROVIDE A MAJOR PORTION OF HEAT SUPPLIED TO SAID SUBSTANCE, A SECOND ELECTRON BOMBARDMENT MEANS DISPOSED ABOVE THE TOP OF SAID CRUCIBLE FOR FURTHER HEATING EVAPORATING PORTIONS OF SAID SUBSTANCE TO TEMPERATURES HIGHER THAN THAT OF SAID CRUCIBLE, EACH OF SAID ELECTRON BOMBARDMENT MEANS INCLUDING A FILAMENTARY CATHODE, ELECTRIC SUPPLY MEANS FOR SUPPLYING HEATING CURRENT TO EACH OF SAID FILAMENTARY CATHODES AND MAINTAINING EACH CATHODE AT A NEGATIVE POTENTIAL RELATIVE TO SAID CRUCIBLE, MEANS FOR REGULATING THE ELECTRON CURRENT OF SAID SECOND ELECTRON BOMBARDMENT MEANS, AND A HIGHVACUUM CHAMBER CONTAINING SAID CRUCIBLE AND SAID CATHODES.
References Cited (Backward Citations)
US2074281A
Cited
US2100045A
Cited
US2391595A
Cited
US2378476A
Cited
US2527747A
Cited
US2665320A
Cited
GB754102A
Cited
US2761793A
Cited
US2887413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |