US3826729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sputtering holes with ion beamlets
Assignee: National Aeronautics and Space Administration
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Filing: 1972-09-27
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Granted: 1974-07-30
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Expires: 1992-09-27
Abstract
Abstract ION BEAMLETS OF PREDETERMINED CONFIGURATIONS ARE FORMED BY SHAPED APERTURES IN THE SCREEN GRID OF AN ION THRUSTER HAVING A DOUBLE GRID ACCELERATOR SYSTEM. A PLATE IS PLACED DOWNSTREAM FROM THEE SCREEN GRID HOLES AND ATTACHED TO THE ACCELERATOR GRID. WHEN THE ION THRUSTER IS OPERATED HOLES HAVING THE CONFIGURATION OF THE BEAMLETS FORMED BY THE SCREEN GRID ARE SPUTTERED THROUGH THE PLATE AT THE ACCELERATOR GRID.
Inventors
- 👤 D Byers
- 👤 B Banks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:45
CPC Classifications
C; C23; C23F; C23F4/00; C23C; C23C14/00; C23C14/22; C23C14/34; C23C14/35
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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |