Patent US3581245A successfully refreshed from Google Patents.
US3581245A
Expired / Lapsed
US
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Microwave absorber for waveguide termination
Assignee: Kokusai Denki Electric Inc
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Filing: 1968-09-27
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Granted: 1971-05-25
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Expires: 1988-09-27
Abstract
Abstract A microwave terminator having a microwave absorber in the form of a plate which is fixed bodily to a shortcircuiting plate of metal disposed at a right angle with the axis of a waveguide. The microwave absorber is made from a composition consisting of a powdery ferromagnetic material, carbon powder and a binder therefor, and is shaped to have a stepwise or continuously varied thickness distribution.
Inventors
- 👤 Kunio Ohi
- 👤 Hideaki Inoue
- 👤 Toshio Nakayama
- 👤 Sosuke Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:25
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/24; H01P1/26; H01P1/264
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
153 words
A microwave terminator for a waveguide comprising a shortcircuiting plate of metal material disposed at a right angle with the axis of the wave guide, and a microwave absorbing member in the form of a plate fixed to said short-circuiting plate while in bodily contact therewith, in which said microwave absorbing member is made by mixing a powdery ferromagnetic material having a grain size of 1 to 20 microns with carbon powder having a grain size of 1 to 20 microns in the proportion by weight of 20:80 percent to 80:20 percent, mixing the mixture with a synthetic resin binder in the proportion by weight of from 40:60 percent to 70:30 percent, heating to boil the composition until it solidifies, pulverizing the composition into powder having a grain size of 20 to 500 microns, and baking the powder to 5 to 15 minutes at a constant temperature between 160* C. and 220* C.
Claim 2
Dependent Claim
153 words
A microwave terminator for a waveguide comprising a shortcircuiting plate of metal material disposed at a right angle with the axis of the wave guide, and a microwave absorbing member in the form of a plate fixed to said short-circuiting plate while in bodily contact therewith, in which said microwave absorbing member is made by mixing a powdery ferromagnetic material having a grain size of 1 to 20 microns with carbon powder having a grain size of 1 to 20 microns in the proportion by weight of 20:80 percent to 80:20 percent, mixing the mixture with a synthetic resin binder in the proportion by weight of from 40:60 percent to 70:30 percent, heating to boil the composition until it solidifies, pulverizing the composition into powder having a grain size of 20 to 500 microns, and baking the powder to 5 to 15 minutes at a constant temperature between 160* C. and 220* C.
Claim 3
Dependent Claim
22 words
A microwave terminator according to claim 1, in which said microwave absorbing member is molded to have a stepwise varied thickness distribution.
Claim 4
Dependent Claim
22 words
A microwave terminator according to claim 1, in which said microwave absorbing member is molded to have a continuously varied thickness distribution.
Claim 5
Dependent Claim
162 words
A microwave absorbing member in the form of a plate for use in a microwave terminator for a waveguide, characterized in that said microwave absorbing member is fixed while in bodily contact with the short-circuiting plate of metal material disposed at a right angle with the axis of the waveguide, and further characterized in that said microwave absorbing member is Made by mixing a powdery ferromagnetic material having a grain size of 1 to 20 microns with carbon powder having a grain size of 1 to 20 microns in the proportion by weight of from 20:80 percent to 80: 20 percent, mixing the mixture with a synthetic resin binder in the proportion by weight of from 40:60 percent to 70:30 percent, heating to boil the composition until it solidifies, pulverizing the composition into powder having a grain size of 20 to 500 microns, and baking the powder for 5 to 15 minutes at a constant temperature between 160* C. and 220* C.
Claim 6
Dependent Claim
162 words
A microwave absorbing member in the form of a plate for use in a microwave terminator for a waveguide, characterized in that said microwave absorbing member is fixed while in bodily contact with the short-circuiting plate of metal material disposed at a right angle with the axis of the waveguide, and further characterized in that said microwave absorbing member is Made by mixing a powdery ferromagnetic material having a grain size of 1 to 20 microns with carbon powder having a grain size of 1 to 20 microns in the proportion by weight of from 20:80 percent to 80: 20 percent, mixing the mixture with a synthetic resin binder in the proportion by weight of from 40:60 percent to 70:30 percent, heating to boil the composition until it solidifies, pulverizing the composition into powder having a grain size of 20 to 500 microns, and baking the powder for 5 to 15 minutes at a constant temperature between 160* C. and 220* C.
Claim 7
Dependent Claim
24 words
A microwave absorbing member according to claim 4, characterized in that said microwave absorbing member is molded to have a stepwise varied thickness distribution.
Claim 8
Dependent Claim
24 words
A microwave absorbing member according to claim 4, characterized in that said microwave absorbing member is molded to have a continuously varied thickness distribution.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |