Patent US4918450A successfully refreshed from Google Patents.
Patent US3619840A successfully refreshed from Google Patents.
US3619840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron beam evaporation source
Assignee: Optical Coating Laboratory Inc
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Filing: 1969-07-10
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Granted: 1971-11-16
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Expires: 1989-07-10
Abstract
Abstract ELECTRON BEAM EVAPORATION SOURCE HAVING AT LEAST ONE ELECTRON GUN AND IN WHICH EACH ELECTRON GUN IS PROVIDED WITH A WATER-COOLED CATHODE ASSEMBLY AND MEANS IS PROVIDED FOR ROTATING THE BODY OF MATERIAL WHICH IS TO BE EVAPORATED TO ACHIEVE A MORE UNIFORM RATE OF EVAPORATION. TO PERMIT OPERATION FOR LONG PERIODS OF TIME, MEANS IS PROVIDED FOR CONTINOUSLY SUPPLYING MATERIAL TO BE EVAPORATED. IN ADDITION, IN ORDER TO ACHIEVE GREATER EVAPORATION RATES, A PLURALITY OF ELECTRON GUNS ARE UTILIZED FOR EVAPORATING MATERIAL FROM THE SAME BODY OF MATERIAL.
Inventors
- 👤 Vernon C Spellman
- 👤 Nils H Bergfelt
- 👤 Edward A Small
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:10
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/02; H01J37/18; H01J37/30; H01J37/305; H01J37/3053
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |