US3214086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum pumps
Assignee: Compagnie Francaise Thomson Houston SA
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Filing: 1962-12-13
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Granted: 1965-10-26
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Expires: 1982-12-13
Abstract
No abstract record available.
Inventors
- 👤 Matricon Marcel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:35
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/12; H01J41/18; H01J41/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN A VACUUM PUMP OF THE EVAPORATION AND IONISATION TYPE COMPRISING A HERMETICALLY SEALED ENCLOSURE DEFINED BY A WALL OF NON-MAGNETIC MATERIAL, A GAS-ABSORBING COATING ON THE INNER FACE OF SAID WALL, A GRID-FORM ELECTRODE LOCATED AXIALLY WITHIN SAID ENCLOSURE, MEANS FOR CONNECTING SAID ENCLOSURE AND SAID GRID-FORM ELECTRODE TO A VOLTAGE SOURCE WHEREBY THE INNER FACE OF SAID WALL AND SAID GAS-ABSORBING COATING CAN ACT AS A CATHODE, THE GRID-FORM ELECTRODE THEN HAVING A POTENTIAL WHICH IS HIGHLY POSITIVE WITH RESPECT TO SAID CATHODE, AND AT LEAST ONE PERMANENT MAGNET MOUNTED ON THE OUTSIDE OF SAID WALL, WITH THE POLE OF SAID MAGNET NEXT ADJACENT SAID WALL, THE IMPROVEMENT WHICH CONSISTS IN AN ADDITIONAL PERMANENT MAGNET LOCATED WHOLLY BETWEEN THE POLES OF SAID AT LEAST ONE PERMANENT MAGNET AND OUTSIDE SAID WALL, LIKE POLES OF SAID TWO MAGNETS BEING LOCATED ADJACENT EACH OTHER.
Claim 2
Dependent Claim
144 words
IN A VACUUM PUMP OF THE EVAPORATION AND IONISATION TYPE COMPRISING A HERMETICALLY SEALED ENCLOSURE DEFINED BY A WALL OF NON-MAGNETIC MATERIAL, A GAS-ABSORBING COATING ON THE INNER FACE OF SAID WALL, A GRID-FORM ELECTRODE LOCATED AXIALLY WITHIN SAID ENCLOSURE, MEANS FOR CONNECTING SAID ENCLOSURE AND SAID GRID-FORM ELECTRODE TO A VOLTAGE SOURCE WHEREBY THE INNER FACE OF SAID WALL AND SAID GAS-ABSORBING COATING CAN ACT AS A CATHODE, THE GRID-FORM ELECTRODE THEN HAVING A POTENTIAL WHICH IS HIGHLY POSITIVE WITH RESPECT TO SAID CATHODE, AND AT LEAST ONE PERMANENT MAGNET MOUNTED ON THE OUTSIDE OF SAID WALL, WITH THE POLE OF SAID MAGNET NEXT ADJACENT SAID WALL, THE IMPROVEMENT WHICH CONSISTS IN AN ADDITIONAL PERMANENT MAGNET LOCATED WHOLLY BETWEEN THE POLES OF SAID AT LEAST ONE PERMANENT MAGNET AND OUTSIDE SAID WALL, LIKE POLES OF SAID TWO MAGNETS BEING LOCATED ADJACENT EACH OTHER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |