US3783420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for coupling and bandpass control in uhf varactor tuners
Assignee: Oak Industries Inc
•
Filing: 1972-11-20
•
Granted: 1974-01-01
•
Expires: 1992-11-20
Abstract
Abstract A method for optimizing coupling and bandpass control in UHF varactor tuners by using two or more types of plating materials.
Inventors
- 👤 E Bastian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:45
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0007; H05K9/006; H03; H03D; H03D9/00; H03D9/06; H03D9/0608; H03D9/0625; H03J; H03J3/00; H03J3/02; H03J3/16; H03J3/18; H03J3/185
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
In a UHF tuner, a chassis, at least two cavities in said chassis, a shield between said cavities, one of said cAvities including an antenna resonator, another of said cavities including mutually coupled RF amplifier and mixer resonators, a shield between said mutually coupled RF amplifier and mixer resonators, the shields and cavity walls being plated with dissimilar conductive materials to control the coupled bandwidth between the RF and mixer resonators and to control the bandwidth of the antenna resonator.
Claim 2
Dependent Claim
80 words
In a UHF tuner, a chassis, at least two cavities in said chassis, a shield between said cavities, one of said cAvities including an antenna resonator, another of said cavities including mutually coupled RF amplifier and mixer resonators, a shield between said mutually coupled RF amplifier and mixer resonators, the shields and cavity walls being plated with dissimilar conductive materials to control the coupled bandwidth between the RF and mixer resonators and to control the bandwidth of the antenna resonator.
Claim 3
Dependent Claim
29 words
The UHF tuner of claim 1 further characterized in that said shields are plated with one conductive material and the chassis walls are plated with a second conductive material.
Claim 4
Dependent Claim
30 words
The UHF tuner of claim 2 further characterized in that said shields are plated with a tin-zinc conductive material and the chassis walls are plated with a tin-copper conductive material.
Claim 5
Dependent Claim
29 words
The UHF tuner of claim 3 further characterized in that said tin-zinc conductive material has proportions of on the order of about 78 percent tin and 22 percent zinc.
Claim 6
Dependent Claim
29 words
The UHF tuner of claim 3 further characterized in that said tin-copper conductive material has proportions of on the order of about 88 percent copper and 12 percent tin.
Claim 7
Independent Claim
47 words
The method for optimizing characteristics of bandwidth, interstage coupling and overall tuned bandwidth in resonant cavities having a metal chassis forming the walls of the cavities and metal shields between the resonant cavities including the step of plating the shields and cavity walls with dissimilar conductive materials.
Claim 8
Independent Claim
47 words
The method for optimizing characteristics of bandwidth, interstage coupling and overall tuned bandwidth in resonant cavities having a metal chassis forming the walls of the cavities and metal shields between the resonant cavities including the step of plating the shields and cavity walls with dissimilar conductive materials.
Claim 9
Dependent Claim
28 words
The method of claim 6 further characterized in that said shields are plated with one conductive material and the chassis walls are plated with a second conductive material.
Claim 10
Dependent Claim
29 words
The method of claim 7 further characterized in that said shields are plated with a tin-zinc conductive material and the chassis walls are plated with a tin-copper conductive material.
Claim 11
Dependent Claim
28 words
The method of claim 8 further characterized in that said tin-zinc conductive material has proportions of on the order of about 78 percent tin and 22 percent zinc.
Claim 12
Dependent Claim
28 words
The method of claim 8 further characterized in that said tin-copper conductive material has proportions of on the order of about 88 percent copper and 12 percent tin.
References Cited (Backward Citations)
US2465639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |