Patent US5233491A successfully refreshed from Google Patents.
US3754112A
Expired / Lapsed
US
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Localized heating filaments by induced currents
Assignee: Avco Corp
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Filing: 1972-06-14
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Granted: 1973-08-21
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Expires: 1992-06-14
Abstract
Abstract A method and apparatus is disclosed for using a plurality of spaced sequential induction circuits for inducing a predetermined current distribution pattern in a localized segment of a filament. The induced current pattern is controlled by combining the effects of electro-magnetic induction, and standing wave patterns on the filamentary conductor together with the transmission attenuation along the filamentary conductor. Additionally, the effect of the configuration of an induction circuit on induced current is covered.
Inventors
- 👤 Bolt H De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:47
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/40; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2916; Y10T428/2918; Y10T428/292
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
62 words
Means for inducing a predetermined point to point current distribution in a localized segment of a filament comprising: at least a pair of induction circuits disposed in a spaced relationship along the length of said filament, each of said induction circuits inducing localized current in a localized region of said filament, said localized currents interacting to produce a predetermined composite current distribution.
Claim 2
Dependent Claim
62 words
Means for inducing a predetermined point to point current distribution in a localized segment of a filament comprising: at least a pair of induction circuits disposed in a spaced relationship along the length of said filament, each of said induction circuits inducing localized current in a localized region of said filament, said localized currents interacting to produce a predetermined composite current distribution.
Claim 3
Dependent Claim
41 words
Means for inducing a predetermined point to point current distribution in a localized segment of a filament as defined in claim 1 wherein said induction circuits consist essentially of tuned circuits, as loops, modified tuned circuits, modified loops or combinations thereof.
Claim 4
Dependent Claim
58 words
Means for inducinG a predetermined point to point current distribution in a localized segment of a filament as defined in claim 1 wherein at least one of said induction means produces axially spaced impedance discontinuities, said discontinuities inducing currents having standing waves that generate axially spaced current peaks in said filament in a localized region opposite each discontinuity.
Claim 5
Dependent Claim
31 words
Means for inducing a predetermined point to point current distribution in a localized segment of a filament as defined in claim 3 wherein said one induction circuit is a tuned circuit.
Claim 6
Dependent Claim
54 words
Means for inducing a predetermined point to point current distribution in a localized segment of a filament as defined in claim 3 wherein said tuned circuit comprises an L-shaped inductance with one leg of the inductance extending parallel to said filament, the terminal end and the corner of said one leg causing impedance discontinuities.
Claim 7
Dependent Claim
53 words
Means for inducing a predetermined point tp point current distribution in a localized segment of a filament as defined in claim 5 wherein the spacing between said one leg and said filament is varied to induce additional localized impedance discontinuities in the region of said filament between the terminal end and said corner.
Claim 8
Dependent Claim
52 words
Means for inducing a predetermined point to point current distribution in a localized segment of a filament as defined in claim 3 wherein adjacent induction means inducing currents are disposed with the maximum electric field of one induction circuit positioned adjacent to a region of lesser electric field of another induction circuit.
Claim 9
Dependent Claim
54 words
Means for inducing a predetermined point to point current distribution in a localized segment of a filament as defined in claim 3 wherein adjacent induction means inducing currents are disposed with the region of maximum electric field of one induction circuit positioned adjacent to the region of maximum electric field of another induction circuit.
Claim 10
Independent Claim
60 words
A method of heating a filament comprising the steps of: inducing a predetermined point to point localized current in a localized region of said filament by the combination of electromagnetic induction and the introduction of axially spaced impedance discontinuities by at least two induction circuits consisting essentially of tuned circuits, as loops, modified tuned circuits, modified loops or combination thereof.
Claim 11
Independent Claim
60 words
A method of heating a filament comprising the steps of: inducing a predetermined point to point localized current in a localized region of said filament by the combination of electromagnetic induction and the introduction of axially spaced impedance discontinuities by at least two induction circuits consisting essentially of tuned circuits, as loops, modified tuned circuits, modified loops or combination thereof.
Claim 12
Dependent Claim
50 words
In a method whereby a carbon filament is heated near or at graphitizing temperatures, the improvement comprising supplying localized heat by inducing two or more axially spaced and predetermined point to point localized currents in a localized region of the carbon filament to add heat to said carbon filament locally.
Claim 13
Dependent Claim
50 words
In a method whereby a carbon filament is heated near or at graphitizing temperatures, the improvement comprising supplying localized heat by inducing two or more axially spaced and predetermined point to point localized currents in a localized region of the carbon filament to add heat to said carbon filament locally.
Claim 14
Independent Claim
84 words
A method of making a high-strength high-modulus filament comprising the steps of: a. providing a substrate filament into which currents can be induced; b. drawing the substrate filament through a reactor containing vapors which react at elevated temperatures to deposit boron or SiC on a heated substrate, said filaments being heated along its entire length by a first source of heat; and c. supplying localized heat by inducing two or more axially spaced and localized currents in a localized region of the substrate filament.
Claim 15
Independent Claim
84 words
A method of making a high-strength high-modulus filament comprising the steps of: a. providing a substrate filament into which currents can be induced; b. drawing the substrate filament through a reactor containing vapors which react at elevated temperatures to deposit boron or SiC on a heated substrate, said filaments being heated along its entire length by a first source of heat; and c. supplying localized heat by inducing two or more axially spaced and localized currents in a localized region of the substrate filament.
Claim 16
Independent Claim
96 words
A method of making a high-strength high-modulus filament comprising the steps of: a. providing a substrate filament into which currents can be induced; b. drawing the substrate filament through a reactor containing vapors which react at elevated temperatures to deposit a coating taken from the class consisting essentially of TiB2, B4C, BN, TiC or TaC4 on a heated substrate, said filaments being heated along its entire length by a first source of heat; and c. supplying localized heat by inducing two or more axially spaced and localized currents in a localized region of the substrate filament.
Claim 17
Independent Claim
96 words
A method of making a high-strength high-modulus filament comprising the steps of: a. providing a substrate filament into which currents can be induced; b. drawing the substrate filament through a reactor containing vapors which react at elevated temperatures to deposit a coating taken from the class consisting essentially of TiB2, B4C, BN, TiC or TaC4 on a heated substrate, said filaments being heated along its entire length by a first source of heat; and c. supplying localized heat by inducing two or more axially spaced and localized currents in a localized region of the substrate filament.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |