Patent US3398685A successfully refreshed from Google Patents.
US3398685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion drag pumps
Assignee: Northrop Grumman Guidance and Electronics Co Inc
•
Filing: 1961-09-11
•
Granted: 1968-08-27
•
Expires: 1981-09-11
Abstract
No abstract record available.
Inventors
- 👤 Otmar M Stuetzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:37
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/12; H01J41/18; Y; Y10; Y10S; Y10S55/00; Y10S55/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
APPARATUS FOR CONTINUOUSLY PUMPING AN INSULATING LIQUID COMPRISING AN ELONGATED TUBULAR SHAPED HOUSING, A SOLID COLD EMITTER ELECTRODE POSITIONED IN SAID HOUSING, A COLLECTOR ELECTRODE SPACED DOWNSTREAM FROM SAID EMITTER ELECTRODE A DISTANCE NO GREATER THAN THE LARGEST INTERNAL CROSS-SECTIONAL DIMENSION OF SAID HOUSING, FLOW CONSTRICTING MEANS IN SAID HOUSING FORMING A CONSTRICTED OPENING ADJACENT THE DOWNSTREAM END OF SAID EMITTER ELECTRODE, SAID MEANS DEFINING A FLOW PATH WHICH IS DIVERGENT FROM SAID CONSTRICTED OPENING IN THE DOWNSTREAM DIRECTION THEREFROM, AND MEANS CONNECTED BETWEEN SAID ELECTRODES TO ESTABLISH IONIZATION AND A HIGH FIELD STRENGTH IN THE LIQUID BETWEEN SAID ELECTRODES AND BETWEEN THE ENDS OF SAID DIVERGENT FLOW PATH.
Claim 2
Dependent Claim
109 words
APPARATUS FOR CONTINUOUSLY PUMPING AN INSULATING LIQUID COMPRISING AN ELONGATED TUBULAR SHAPED HOUSING, A SOLID COLD EMITTER ELECTRODE POSITIONED IN SAID HOUSING, A COLLECTOR ELECTRODE SPACED DOWNSTREAM FROM SAID EMITTER ELECTRODE A DISTANCE NO GREATER THAN THE LARGEST INTERNAL CROSS-SECTIONAL DIMENSION OF SAID HOUSING, FLOW CONSTRICTING MEANS IN SAID HOUSING FORMING A CONSTRICTED OPENING ADJACENT THE DOWNSTREAM END OF SAID EMITTER ELECTRODE, SAID MEANS DEFINING A FLOW PATH WHICH IS DIVERGENT FROM SAID CONSTRICTED OPENING IN THE DOWNSTREAM DIRECTION THEREFROM, AND MEANS CONNECTED BETWEEN SAID ELECTRODES TO ESTABLISH IONIZATION AND A HIGH FIELD STRENGTH IN THE LIQUID BETWEEN SAID ELECTRODES AND BETWEEN THE ENDS OF SAID DIVERGENT FLOW PATH.
References Cited (Backward Citations)
US1980521A
Cited
US2182751A
Cited
US2279586A
Cited
US2525347A
Cited
US2600129A
Cited
US2765975A
Cited
US2851618A
Cited
US2809314A
Cited
US3041824A
Cited
US2862099A
Cited
US3022430A
Cited
US2880337A
Cited
US3071705A
Cited
FR1246669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |