US4213004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hermetic electrical feedthrough for aluminum housing and method of making same
Assignee: United States Department of the Air Force
•
Filing: 1978-06-30
•
Granted: 1980-07-15
•
Expires: 1998-06-30
Abstract
Abstract A leak-tight joint between a Kovar ceramic feed-through and an aluminum housing is obtained by electron beam welding a short length of the outside surface of the Kovar cylindrical shell of the feedthrough to a region of nickel deposited on a thin wall cylindrical tube of aluminum formed in the aluminum housing.
Inventors
- 👤 Roy M. Acker
- 👤 Kenneth Lui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:58
CPC Classifications
H; H01; H01B; H01B17/00; H01B17/26; H01B17/30; H01B17/303; H01B17/305; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
The improvement in mounting a ceramic electrical feedthrough insulator having a low coefficient of expansion nickel-cobalt-iron alloy cylinder with an exterior shoulder, in an aluminum housing comprising the steps of: a. through-boring a hole in the aluminum housing; b. machining a channel recess in the aluminum housing concentric with the said through-bore providing an aluminum cylinder having a free end; c. plating a region of nickel on the said free end of the aluminum cylinder; d. machining a counter bore in the inner surface of the said aluminum cylinder providing a thin wall cylinder of aluminum having a nickel end region; e. positioning the said feedthrough insulator in the said counter bore with the said exterior shoulder adjacent the said nickel end region; and f. electron beam welding the said exterior shoulder of the said feedthrough to the said nickel region.
Claim 2
Dependent Claim
141 words
The improvement in mounting a ceramic electrical feedthrough insulator having a low coefficient of expansion nickel-cobalt-iron alloy cylinder with an exterior shoulder, in an aluminum housing comprising the steps of: a. through-boring a hole in the aluminum housing; b. machining a channel recess in the aluminum housing concentric with the said through-bore providing an aluminum cylinder having a free end; c. plating a region of nickel on the said free end of the aluminum cylinder; d. machining a counter bore in the inner surface of the said aluminum cylinder providing a thin wall cylinder of aluminum having a nickel end region; e. positioning the said feedthrough insulator in the said counter bore with the said exterior shoulder adjacent the said nickel end region; and f. electron beam welding the said exterior shoulder of the said feedthrough to the said nickel region.
Claim 3
Dependent Claim
127 words
Structure for providing a hermetic electrical feedthrough for an aluminum housing comprising: a. a cylindrical electrical feedthrough insulator having an exterior nickel-cobalt-iron alloy shell enclosing an insulator and central conductor, with a shoulder of determined diameter positioned at one end of the said shell; b. a thin walled aluminum cylinder having a free end fabricated in the said aluminum housing having an inside diameter approximately equal to the said shoulder diameter; c. a nickel region attached to the free end of the said thin walled cylinder; d. the said cylindrical feedthrough insulator positioned within the said thin walled aluminum cylinder with the said shoulder of the nickel-cobalt-iron shell adjacent the said nickel region; and e. an electron beam weld fabricated in the said adjacent nickel and nickel-cobalt-iron.
Claim 4
Dependent Claim
127 words
Structure for providing a hermetic electrical feedthrough for an aluminum housing comprising: a. a cylindrical electrical feedthrough insulator having an exterior nickel-cobalt-iron alloy shell enclosing an insulator and central conductor, with a shoulder of determined diameter positioned at one end of the said shell; b. a thin walled aluminum cylinder having a free end fabricated in the said aluminum housing having an inside diameter approximately equal to the said shoulder diameter; c. a nickel region attached to the free end of the said thin walled cylinder; d. the said cylindrical feedthrough insulator positioned within the said thin walled aluminum cylinder with the said shoulder of the nickel-cobalt-iron shell adjacent the said nickel region; and e. an electron beam weld fabricated in the said adjacent nickel and nickel-cobalt-iron.
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) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |