Patent US3748729A successfully refreshed from Google Patents.
US3748729A
Expired / Lapsed
US
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Traveling wave tube interaction circuit manufacture
Assignee: Unisys Corp
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Filing: 1972-03-07
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Granted: 1973-07-31
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Expires: 1992-03-07
Abstract
Abstract A helix slow wave propagation circuit supported by longitudinally aligned ceramic rods is brazed to the rods by providing seal-forming surfaces on the rods and a plating of brazing material on the helix.
Inventors
- 👤 J Rawls
- 👤 J Bottcher
- 👤 R Pyles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:27
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J23/26; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49016
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
The method As described in claim 1 wherein the step of generating said longitudinally extending layer of metal comprises the sub-steps of: generating on said elongated surface of said ceramic rod a longitudinally extending layer of seal-forming material bonded to said ceramic, and generating on said layer of seal-forming material a longitudinally extending layer of nickel bonded to said seal-forming layer.
Claim 2
Dependent Claim
33 words
The method as described in claim 1 wherein the step of plating a slow wave propagation structure with a layer adapted for use as a brazing material comprises plating said structure with gold.
Claim 3
Dependent Claim
60 words
The method as described in claim 1 additionally including the substep of: temporarily binding in substantially parallel spaced relation a plurality of said ceramic rods about said slow wave propagation structure, each of said ceramic rods when bound having a respective generated longitudinally extending layer of metal in contact with said brazing material layer of said slow wave propagation structure.
Claim 4
Dependent Claim
57 words
The method as described in claim 4 additionally including the steps of: heating said bound plurality of ceramic rods and said slow wave propagation structure in a reducing atmosphere for forming fillets of said brazing material at the contacts between said longitudinally extending layers of metal and said brazing material layer of said slow wave propagation structure.
Claim 5
Dependent Claim
40 words
The method as described in claim 1 wherein said step of removing said plated metal layer not formed into said fillets comprises immersing at least said slow wave propagation structure in an aqueous solution of a reagent for dissolving gold.
Claim 6
Dependent Claim
38 words
The method as described in claim 1 wherein the step of removing said generated longitudinally extending layer where not covered by said fillets comprises immersing at least said ceramic rod in an aqueous acid solution for removing nickel.
References Cited (Backward Citations)
US3548345A
Cited
US3475643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |