US3680013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film attenuator
Assignee: Welwyn Electric Ltd
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Filing: 1971-02-16
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Granted: 1972-07-25
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Expires: 1991-02-16
Abstract
Abstract An electrical film attenuator or other film resistor network comprising an insulating substrate having adherently mounted thereon a single film resistive element, said element being provided with at least three terminals in electrical contact therewith and, on said element and in electrical contact therewith, an electrically conductive layer dividing up said element into three distinct portions two of which will have the same electrical resistance value after removal of part of said element at a locus midway between two of said terminals, one of which being an input and the other an output terminal, the third portion of said electrical resistive element being shaped so as to enable its electrical resistance value to be adjusted by removing part of it, each of said first two portions being in electrical contact with only one of said two terminals, the third portion being electrically connected to the remaining terminal or terminals.
Inventors
- 👤 Walter Arnold Pye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:49
CPC Classifications
H; H01; H01C; H01C7/00; H03; H03H; H03H7/00; H03H7/24; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
149 words
An electrical film attenuator or other film resistor network comprising an insulating substrate having adherently mounted thereon a single film resistive element, said element being provided with at least thrEe terminals in electrical contact therewith and, on said element and in electrical contact therewith, an electrically conductive layer dividing up said element into three distinct portions two of which will have the same electrical resistance value after removal of part of said element at a locus midway between two of said terminals, one of which being an input and the other an output terminal, the third portion of said electrical resistive element being shaped so as to enable its electrical resistance value to be adjusted by removing part of it, each of said first two portions being in electrical contact with only one of said two terminals, the third portion being electrically connected to the remaining terminal or terminals.
Claim 2
Dependent Claim
149 words
An electrical film attenuator or other film resistor network comprising an insulating substrate having adherently mounted thereon a single film resistive element, said element being provided with at least thrEe terminals in electrical contact therewith and, on said element and in electrical contact therewith, an electrically conductive layer dividing up said element into three distinct portions two of which will have the same electrical resistance value after removal of part of said element at a locus midway between two of said terminals, one of which being an input and the other an output terminal, the third portion of said electrical resistive element being shaped so as to enable its electrical resistance value to be adjusted by removing part of it, each of said first two portions being in electrical contact with only one of said two terminals, the third portion being electrically connected to the remaining terminal or terminals.
Claim 3
Dependent Claim
52 words
An attenuator or other film resistor network according to claim 1, in which a total of three terminals are provided, the third of which being a combined input and output terminal, and the third portion of the film resistive element is electrically connected to the third terminal, whereby an unbalanced attenuator results.
Claim 4
Dependent Claim
190 words
An electrical film attenuator or other film resistor network comprising an insulating substrate, adherently mounted thereon a single film resistive element, said element being provided with four terminals in electrical contact therewith and, on said element and in electrical contact therewith, two electrically conductive layers in such a way as to divide up the element into five distinct portions two of which will have the same electrical resistance value after removal of part of said element at a locus midway between a pair of the terminals and two further of which will have the same electrical resistance value after removal of part of said element at a locus midway between the remaining pair of the terminals, said first pair and second pair of terminals each being an output and an input terminal, the fifth portion extending from one to the other of said two electrically conductive layers and being shaped so as to enable its electrical resistance value to be adjusted by removing part of it, each of said four terminals being associated with only one portion of said two sets of two portions having the same electrical resistance value.
Claim 5
Dependent Claim
190 words
An electrical film attenuator or other film resistor network comprising an insulating substrate, adherently mounted thereon a single film resistive element, said element being provided with four terminals in electrical contact therewith and, on said element and in electrical contact therewith, two electrically conductive layers in such a way as to divide up the element into five distinct portions two of which will have the same electrical resistance value after removal of part of said element at a locus midway between a pair of the terminals and two further of which will have the same electrical resistance value after removal of part of said element at a locus midway between the remaining pair of the terminals, said first pair and second pair of terminals each being an output and an input terminal, the fifth portion extending from one to the other of said two electrically conductive layers and being shaped so as to enable its electrical resistance value to be adjusted by removing part of it, each of said four terminals being associated with only one portion of said two sets of two portions having the same electrical resistance value.
Claim 6
Independent Claim
155 words
A method of producing an electrical film attenuator or other film resistor network, which comprises providing an insulating substrate, adherently mounting thereon a single film resistive element, providing said element with at least three terminals in electrical contact therewith and providing on said element and in electrical contact therewith an electrically conductive layer in such a way as to divide up the element into three distinct portions two of which will have the same electrical resistance value after removal of part of said element at a locus midway between two of the terminals, one of which being an input and the other an output terminal, the third portion being shaped so as to enable its electrical resistance value to be adjusted by removing part of it, each of said first two portions being in electrical contact with only one of said two terminals, the third portion being electrically connected to the remaining terminal or terminals.
Claim 7
Independent Claim
155 words
A method of producing an electrical film attenuator or other film resistor network, which comprises providing an insulating substrate, adherently mounting thereon a single film resistive element, providing said element with at least three terminals in electrical contact therewith and providing on said element and in electrical contact therewith an electrically conductive layer in such a way as to divide up the element into three distinct portions two of which will have the same electrical resistance value after removal of part of said element at a locus midway between two of the terminals, one of which being an input and the other an output terminal, the third portion being shaped so as to enable its electrical resistance value to be adjusted by removing part of it, each of said first two portions being in electrical contact with only one of said two terminals, the third portion being electrically connected to the remaining terminal or terminals.
Claim 8
Dependent Claim
42 words
A method according to claim 4, in which a total of three terminals are provided, the third of which being a combined input and output terminal, and the third portion of the resistive film element is electrically connected to the third terminal.
Claim 9
Dependent Claim
100 words
A method according to claim 5, which comprises the further steps of (i) removing part of the resistive film midway between said input and said output terminals, or removing a strip of resistive film of uniform width from the entire edge of said film between them, and (ii) removing part of the resistive film to effectively reduce the width and increase the length of the third portion of the resistive element, whereby it is possible to measure the attenuation achieved or the electrical resistance value of the network so as to enable compensation for minor errors produced by step (i).
Claim 10
Independent Claim
191 words
A method of producing an electrical film attenuator or other film resistor network, which comprises providing an insulating substrate, adherently mounting thereon a single film resistive element, providing said element with four terminals in electrical contact therewith and providing on said element and in electrical contact therewith two electrically conductive layers in such a way as to divide up the element into five distinct portions two of which will have the same electrical resistance value after removal of part of said element at a locus midway between two of the terminals and two further of which will have the same electrical resistance value after removal of part of said element at a locus midway between the remaining of the terminals, said first two and second two terminals being one output and one input terminal, the fifth portion extending from one to the other of said two electrically conductive layers and being shaped so as to enable its electrical resistance value to be adjusted by removing part of it, each of said four terminals being associated with only one of said two sets of two portions having the same electrical resistance value.
Claim 11
Independent Claim
191 words
A method of producing an electrical film attenuator or other film resistor network, which comprises providing an insulating substrate, adherently mounting thereon a single film resistive element, providing said element with four terminals in electrical contact therewith and providing on said element and in electrical contact therewith two electrically conductive layers in such a way as to divide up the element into five distinct portions two of which will have the same electrical resistance value after removal of part of said element at a locus midway between two of the terminals and two further of which will have the same electrical resistance value after removal of part of said element at a locus midway between the remaining of the terminals, said first two and second two terminals being one output and one input terminal, the fifth portion extending from one to the other of said two electrically conductive layers and being shaped so as to enable its electrical resistance value to be adjusted by removing part of it, each of said four terminals being associated with only one of said two sets of two portions having the same electrical resistance value.
Claim 12
Dependent Claim
114 words
A method according to claim 7, which comprises the further steps of (i) removing part of the resistive film midway between each of said first mentioned pair of terminals and said second mentioned pair of terminals, or removing a strip of resistive film of uniform width from the entire edge of said film between each input and corresponding output terminals, and (ii) removing part of the resistive film to effectively reduce the width and increase the length of the third portion of the resistive element, whereby it is possible to measure the attenuation achieved or the electrical resistance value of the network so as to enable compensation for minor errors produced by step (i).
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |