Patent US3613370A successfully refreshed from Google Patents.
US3613370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion thruster
Assignee: National Aeronautics and Space Administration
•
Filing: 1969-11-26
•
Granted: 1971-10-19
•
Expires: 1989-11-26
Abstract
Abstract IMPROVING THE EFFICIENCY OF AN ION THRUSTER BY UTILIZING A RADIAL MAGNETIC FIELD TO ACHIEVE UNIFORMITY IN ELECTRON DENSITY AND ENERGY.
Inventors
- 👤 Wolfgang Knauer
- 👤 Robert L Poeschel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:48
CPC Classifications
F; F03; F03H; F03H1/00; F03H1/0037; F03H1/0056
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |