US3744247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single grid accelerator for an ion thrustor
Assignee: National Aeronautics and Space Administration
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Filing: 1971-09-14
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Granted: 1973-07-10
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Expires: 1991-09-14
Abstract
Abstract A single grid accelerator system for an ion thrustor. A layer of dielectric material is interposed between this metal grid and the chamber containing an ionized propellant for protecting the grid against sputtering erosion.
Inventors
- 👤 P Margosian
- 👤 S Nakanishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:45
CPC Classifications
F; F03; F03H; F03H1/00; F03H1/0037; F03H1/0043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
An electron bombardment ion thruster having an accelerator system as claimed in claim 1 including a second aluminum oxide plate in contact with a surface of said molybdenum layer opposite said first named aluminum oxide plate, and a second molybdenum layer covering said second aluminum oxide plate.
Claim 2
Dependent Claim
45 words
An electron bombardment ion thruster as claimed in claim 2 having a third aluminum oxide plate in contact with the surface of said second molybdenum layer opposite said second aluminum oxide plate, and a third molybdenum layer in contact with said third aluminum oxide plate.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |