Patent US3807945A successfully refreshed from Google Patents.
US3789253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crucible for vaporizing chemically active elements method of manufacturing the same and ion source including said crucible
Assignee: Thales SA
•
Filing: 1972-06-22
•
Granted: 1974-01-29
•
Expires: 1992-06-22
Abstract
Abstract The invention relates to ion sources having two ionization chambers and more particularly to chemical and heat resistant crucibles for use with said sources. The crucible in accordance with the invention is a hollow box of pyrolytic tungsten having two opposite openings in its lateral wall. The crucible is manufactured from a pyrolytic tungsten deposite made on a copper mandrel which is dissolved in an etching bath.
Inventors
- 👤 J Kervizic
- 👤 R Masic
- 👤 A Shroff
- 👤 R Warnecke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:58
CPC Classifications
H; H01; H01J; H01J27/00; H01J27/02; H01J27/08; H01J27/10; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
19 words
An ion source as claimed in claim 1, wherein said chemically active element contained in said crucible is boron.
Claim 2
Dependent Claim
208 words
An ion source comprising a first ionization chamber containing a gas G1 ; a cathode located in said first ionization chamber for emitting electrons, said electrons generating within said first chamber a primary plasma due to the collisions of said electrons with particles of said gas G1 ; a second ionization chamber; a crucible within said second ionization chamber for vaporization of chemically active elements, said crucible comprising a cylindrical hollow box of pyrolitic tungsten having a revolution axis ; said box having a lateral wall and bottom and top walls, said lateral wall having two openings aligned along an axis crossing said lateral wall, said chemically active elements being introduced within said cylindrical hollow box through one of said openings ; and an extraction system for extracting ions obtained in said second ionization chamber through the interaction of said primary plasma with vaporized particles of said elements, said vaporized particles being produced with heating means associated with said cylindrical crucible ; said axis of said openings formed in the lateral wall of said cylindrical crucible being aligned with the mean path of the ion beam emerging from said first ionization chamber, said mean path and said axis being perpendicular with said revolution axis of said cylindrical crucible.
Claim 3
Dependent Claim
20 words
An ion source as claimed in claim 3, wherein said chemically active element contained in said cylindrical crucible is boron.
References Cited (Backward Citations)
US3631283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |