Patent US3777371A successfully refreshed from Google Patents.
US3777371A
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Method of controlling the characteristics impedance of coaxial cables
Assignee: Nortel Networks Ltd
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Filing: 1972-02-16
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Granted: 1973-12-11
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Expires: 1992-02-16
Abstract
Abstract A method is disclosed for adjusting the characteristic impedance of disc insulated coaxial cables. The method consists of varying the spacing between adjacent discs mounted on the center conductor during the manufacturing operation. An increase in impedance results from an increase in the spacing of the discs and, conversely, a decrease in impedance results from a decrease in spacing. The spacing between discs may be varied by changing the rate at which the discs are applied to the conductor which is moving at a constant linear speed.
Inventors
- 👤 R Iyengar
- 👤 D Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:10
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/06; H01B13/18; H01B13/20; H01B13/204; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49004; Y10T29/49117; Y10T29/49123; Y10T29/53; Y10T29/53022; Y10T29/5313; Y10T29/532; Y10T29/53243
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
A method of controlling the characteristic impedance of a disc insulated coaxial cable comprising the steps of: a. advancing an elongated conductor past a disc applying station; b. applying discs to the conductor at said station; and c. changing the rate of application of discs relative to the speed of the conductor in response to a variation in cable impedance while the conductor is being advanced past said station to change the spacing between successive discs on the conductor fRom one uniform spacing to a different uniform spacing.
Claim 2
Independent Claim
88 words
A method of controlling the characteristic impedance of a disc insulated coaxial cable comprising the steps of: a. advancing an elongated conductor past a disc applying station; b. applying discs to the conductor at said station; and c. changing the rate of application of discs relative to the speed of the conductor in response to a variation in cable impedance while the conductor is being advanced past said station to change the spacing between successive discs on the conductor fRom one uniform spacing to a different uniform spacing.
Claim 3
Dependent Claim
76 words
A method as defined in claim 1 further including the steps of: detecting a change in impedance from a predetermined value on a completed length of cable; determining the change in uniform spacing between successive discs required to restore the impedance to said predetermined value; and changing the rate of applying the discs to the conductor of a successive cable length to achieve said required uniform spacing while said conductor is being advanced past said station.
Claim 4
Dependent Claim
63 words
A method as defined in claim 2 wherein the relationship between the impedance and disc spacing is determined from the formula: dZo/dL 69 log10 (D/d) . epsilon e 3/2 ( epsilon -1)tL 2 where dZo change in impedance and dL change in spacing between discs and where D, d, epsilon e, epsilon , t and L are known parameters of a given cable.
Claim 5
Dependent Claim
35 words
A method as defined in claim 3 wherein the uniform spacing between successive discs is changed by altering the rate at which the discs are applied to the conductor advancing at a constant linear speed.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |