Patent US4404745A successfully refreshed from Google Patents.
US4404745A
Expired / Lapsed
US
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Process for sealing VHF component in case
Assignee: Thales SA
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Filing: 1981-02-26
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Granted: 1983-09-20
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Expires: 2001-02-26
Abstract
Abstract A process of construction of a device for hermetic sealing in a case comprising a sealed ceramic crossover formed by a metal conductor, without having recourse to the technology of cast alumina, which is delicate and costly, and without using sealing glass which is undesirable for very high frequencies. The process comprises the manufacture of molded parts by pressing green alumina to which binders have been added, so as to obtain a case bottom and a frame, which is metalized only after previous firing at 1000° C., using the molybdenum-manganese deposit by silk-screen printing, then which is sintered at the normal temperature of alumina at 1500° C.
Inventors
- 👤 Jean C. Resneau
- 👤 Jean Doyen
- 👤 Robert Ribier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:12
CPC Classifications
H; H10; H10W; H10W76/00; H10W76/10; H10W76/12; H10W76/15; H10W76/157; H10W76/13; H10W76/134; H10W76/17; H10W76/18; H10W76/60; H10W95/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49121; Y10T29/49124; Y10T29/4913; Y10T29/49146
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
A process for the hermetic sealing of a very-high-frequency component in a case, said process comprising the steps of: manufacturing of a first and a second part from green alumina by grinding, drying and pressing of said parts after addition of organic binders; heating said first and second manufactured parts at 1000° for a period of time greater than one hour; depositing by silk-screen printing of refractory metalizations made from an alloy refractory at the sintering temperature of said green alumina on the large face of one of said parts in order to form conducting crossovers on the contacting surface of said first and second parts and stove-drying said first and second manufactured parts at 100° C.; positioning and assemblying said first and second parts and compressing said first and second parts together; and heating said assembled parts at 1500° C. for a period of more than one hour.
Claim 2
Dependent Claim
149 words
A process for the hermetic sealing of a very-high-frequency component in a case, said process comprising the steps of: manufacturing of a first and a second part from green alumina by grinding, drying and pressing of said parts after addition of organic binders; heating said first and second manufactured parts at 1000° for a period of time greater than one hour; depositing by silk-screen printing of refractory metalizations made from an alloy refractory at the sintering temperature of said green alumina on the large face of one of said parts in order to form conducting crossovers on the contacting surface of said first and second parts and stove-drying said first and second manufactured parts at 100° C.; positioning and assemblying said first and second parts and compressing said first and second parts together; and heating said assembled parts at 1500° C. for a period of more than one hour.
Claim 3
Dependent Claim
58 words
A process as claimed in claim 1, comprising the further steps of: depositing of metalizations on the faces of said assembly of parts in order to prepare said assembly of parts for soldering of a cover and a heat-dissipation plate onto said assembly; and mounting of said electronic component to be hermetically sealed and finishing of said device.
Claim 4
Dependent Claim
36 words
A process as claimed in claim 1, wherein said first and second parts are respectively a frame intended to form the side walls and a plate intended to form the bottom of an electronic component case.
References Cited (Backward Citations)
US3404213A
Cited
DE2026741C
Cited
FR2118752A5
Cited
GB1369627A
Cited
US3676569A
Cited
US3683241A
Cited
US3769560A
Cited
US3872583A
Cited
GB1474902A
Cited
US4137628A
Cited
US4297722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |