Patent US3873944A successfully refreshed from Google Patents.
US3873944A
Expired / Lapsed
US
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Bonding of ferrite to metal for high-power microwave applications
Assignee: Varian Medical Systems Inc
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Filing: 1973-03-01
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Granted: 1975-03-25
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Expires: 1993-03-01
Abstract
Abstract A ferrite-to-metal bond suitable for the environment of a highpower microwave circulator is disclosed. The bonding surface of a gyromagnetic ferrite or garnet button is metallized by a sputtering process that deposits successive layers of nichrome, copper and gold thereon. During the sputtering process, a flexible stainless steel band surrounds the button to prevent sputtered material from being deposited on other than the bonding surface of the button. The metallized bonding surface is then soldered to a metal wall of the circulator. The bond so formed is capable of withstanding a peak power level in the circulator of 2.0 megawatts and an average power level of 3.5 kilowatts under standing-wave conditions.
Inventors
- 👤 Victor A Vaguine
- 👤 Dennis R Nichols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:06
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/32; H01P1/38; H01P1/383; C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/122; C04B2237/124; C04B2237/125; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/40; C04B2237/50; C04B2237/70; C04B2237/708; C04B2237/72; C04B2237/86
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
42 words
A MICROWAVE CIRCULATOR COMPRISING A METAL WALL, A GYROMAGNETIC FERRITE BUTTON, AND A BOND AFFIXING SAID BUTTON TO SAID WALL, SAID WALL COMPRISING AT LEAST THREE METAL LAYERS, EACH OF SAID LAYERS COMPRISING A DIFFERENT METAL FROM THE OTHERS OF SAID LAYERS.
Claim 2
Dependent Claim
42 words
A MICROWAVE CIRCULATOR COMPRISING A METAL WALL, A GYROMAGNETIC FERRITE BUTTON, AND A BOND AFFIXING SAID BUTTON TO SAID WALL, SAID WALL COMPRISING AT LEAST THREE METAL LAYERS, EACH OF SAID LAYERS COMPRISING A DIFFERENT METAL FROM THE OTHERS OF SAID LAYERS.
Claim 3
Dependent Claim
13 words
The microwave circulator of claim 1 wherein said button is made of garnet.
Claim 4
Dependent Claim
37 words
The microwave circulator of claim 1 wherein one of said metal layers comprises a first layer in contact with said button, said first layer comprising a metal selected from the group consisting of nichrome, molybdenum and chromium.
Claim 5
Dependent Claim
27 words
The microwave circulator of claim 3 wherein another of said metal layers comprises a second layer in contact with said first layer, said second layer comprising copper.
Claim 6
Dependent Claim
27 words
The microwave circulator of claim 4 wherein another of said metal layers comprises a third layer in contact with said second layer, said third layer comprising gold.
Claim 7
Dependent Claim
23 words
The microwave circulator of claim 5 further comprising a layer of solder in contact with both said third layer and said metal wall.
Claim 8
Dependent Claim
11 words
The microwave circulator of claim 6 wherein said solder comprises indium.
Claim 9
Dependent Claim
16 words
The microwave circulator of claim 6 wherein said solder comprises a mixture of lead and tin.
Claim 10
Dependent Claim
38 words
The microwave circulator of claim 4 wherein another of said metal layers comprises a final layer comprising a mixture of solder and gold, said final layer being in contact with both said second layer and said metal wall.
Claim 11
Dependent Claim
11 words
The microwave circulator of claim 9 wherein said solder comprises indium.
Claim 12
Dependent Claim
16 words
The microwave circulator of claim 9 wherein said solder comprises a mixture of lead and tin.
Claim 13
Dependent Claim
55 words
In a microwave transmission system, a circulator comprising a metal wall, a gyromagnetic ferrite button, a bond affixing said button to said wall, said bond comprising at least three metal layers, each of said layers comprising a different metal from the others of said layers, and means for applying a magnetic field to said button.
Claim 14
Dependent Claim
55 words
In a microwave transmission system, a circulator comprising a metal wall, a gyromagnetic ferrite button, a bond affixing said button to said wall, said bond comprising at least three metal layers, each of said layers comprising a different metal from the others of said layers, and means for applying a magnetic field to said button.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |