Patent EP0111134A1 successfully refreshed from Google Patents.
US3745508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selectable fixed impedance device
Assignee: Bourns Inc
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Filing: 1972-05-25
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Granted: 1973-07-10
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Expires: 1992-05-25
Abstract
Abstract An impedance device in which the impedance can be selected within a range of predetermined fixed values. The device is comprised of an electrically insulating substrate on which is attached an impedance network, a plurality of electrically conductive terminations including at least two end terminations and a number of intermediate terminations which are electrically connected to the network at preselected locations, electrically conductive collector means spaced a short distance from each of the intermediate terminations and electrically insulated from the network, spacing means for spacing the collector means from the intermediate terminations and means for selectively connecting selected intermediate terminations to the collector means.
Inventors
- 👤 V Steuer
- 👤 F Bruder
- 👤 J Parham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:13
CPC Classifications
H; H01; H01C; H01C1/00; H01C1/16
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
181 words
A selectable fixed impedance device comprised of a. an electrically insulative substrate; b. an impedance network on said substrate; c. a plurality of electrically conductive terminations located on said substrate, said terminations comprised of at least two end terminations electrically connected to respective ends of said network and adapted for connections to an external electric circuit and intermediate terminations electrically connected to said network at predetermined spaced intervals for dividing said network into a plurality of separate impedances; d. electrically conductive collector means adjacent to and spaced a short distance from each of said intermediate terminations for selective electrical connection thereto to form a desired electric circuit path through said impedance network including predetermined ones of said separate impedances; e. and means for maintaining said collector means and said intermediate terminations in an electrically insulated relationship, at least part of said last mentioned means providing an externally accessible open space between said collector means and said intermediate terminations for enabling a provisional or permanent electrical connection to be made between said collector means and at least one of said intermediate terminations.
Claim 2
Dependent Claim
181 words
A selectable fixed impedance device comprised of a. an electrically insulative substrate; b. an impedance network on said substrate; c. a plurality of electrically conductive terminations located on said substrate, said terminations comprised of at least two end terminations electrically connected to respective ends of said network and adapted for connections to an external electric circuit and intermediate terminations electrically connected to said network at predetermined spaced intervals for dividing said network into a plurality of separate impedances; d. electrically conductive collector means adjacent to and spaced a short distance from each of said intermediate terminations for selective electrical connection thereto to form a desired electric circuit path through said impedance network including predetermined ones of said separate impedances; e. and means for maintaining said collector means and said intermediate terminations in an electrically insulated relationship, at least part of said last mentioned means providing an externally accessible open space between said collector means and said intermediate terminations for enabling a provisional or permanent electrical connection to be made between said collector means and at least one of said intermediate terminations.
Claim 3
Dependent Claim
16 words
A device as in claim 1 wherein said collector means is embedded in said spacer means.
Claim 4
Dependent Claim
14 words
A device as in claim 1 further including means for sealing said impedance network.
Claim 5
Dependent Claim
14 words
A device as in claim 1 wherein said impedance network is a resistance network.
Claim 6
Dependent Claim
16 words
A device as in claim 4 wherein said resistance network is formed of a cermet material.
Claim 7
Dependent Claim
14 words
A device as in claim 1 wherein said impedance network is an inductance network.
Claim 8
Dependent Claim
21 words
A device as in claim 6 wherein said inductance network is comprised of a plurality of inductance portions connected in series.
Claim 9
Dependent Claim
22 words
A device as in claim 7 wherein said inductance network is formed of a winding of electrically conductive material around a core.
Claim 10
Dependent Claim
28 words
A device as in claim 8 wherein said winding is formed of printed termination material and said core is formed of a printed layer of a ferrite material.
Claim 11
Dependent Claim
13 words
A device as in claim 1 wherein said impedance is a capacitance network.
Claim 12
Dependent Claim
21 words
A device as in claim 10 wherein said capacitance network is comprised of a plurality of capacitance portions connected in parallel.
Claim 13
Dependent Claim
37 words
A device as in claim 11 wherein said capacitance network is formed of a common electrode for all of said capacitance portions, a dielectric, a plurality of second electrodes each being electrically connected to an intermediate termination.
Claim 14
Dependent Claim
32 words
A device as in claim 12 wherein said common electrode is formed of a layer of termination material and said second electrodes are each formed of a thin portion of termination material.
Claim 15
Dependent Claim
26 words
A device as in claim 1 in which said impedance network is comprised of two separate resistance parts which are used to provide a voltage divider.
Claim 16
Dependent Claim
15 words
A device as in claim 14 wherein said collector means includes three separate collector members.
Claim 17
Dependent Claim
114 words
A device as in claim 15 wherein the first of said resistance parts has a total resistance value of approximately 110 percent of a nominal resistance value, the second of said resistance parts has a total value of approximately 20 percent of the nominal resistance value, and said intermediate terminations are divided into three sets, the first two sets being connected to said first resistance part and dividing it into resistance portions each having a value of approximately 10 percent of the nominal resistance value and the third set being connected to said second resistance part and dividing it into resistance portions each having a value of approximately 2 percent of the nominal resistance.
Claim 18
Dependent Claim
186 words
A device as iN claim 16 wherein pairs of intermediate terminations are provided, one termination from each of said first two sets, which include therebetween a section of said first resistance part having a total value of approximately 20 percent of the nominal value, said first, second and third collector members, respectively, being electrically connected to one end of said second resistance part, said second collector member being electrically connected to the other end of said second resistance part so that said second resistance part is in parallel with said section of said first resistance part whenever one of said pairs of terminations is connected to the respective collector members; whereby when a voltage is applied between the ends of said first resistance part, after a selected pair of intermediate terminations are each connected to their respective collector members and a selected one of said third set of intermediate terminations is connected to said third collector member, the output voltage through an end termination connected to said third collector member is a predetermined percentage of the input voltage as determined by the three selected intermediate terminations.
Claim 19
Dependent Claim
25 words
A device as in claim 1 wherein said intermediate terminations divide said impedance network into impedance portions having a predetermined mathematical relationship to each other.
Claim 20
Dependent Claim
70 words
A device as in claim 18 wherein said impedance network includes two or more sets of impedance portions a first of said sets being comprised of portions of substantially equal impedance approximately 10 percent of the nominal impedance value of the device and a second of said sets being comprised of at least nine portions of substantially equal impedance approximately 1 percent of the nominal impedance value of the device.
Claim 21
Dependent Claim
39 words
A device as in claim 19 wherein said impedance network also includes a portion having an impedance of approximately 50 percent of the nominal impedance value of the device, and there are five impedance portions in said first set.
Claim 22
Dependent Claim
17 words
A device as in claim 20 wherein said portions of said impedance network are connected in series.
Claim 23
Dependent Claim
21 words
A device as in claim 1 wherein said impedance network further includes a separate impedance portion having its own end terminations.
Claim 24
Dependent Claim
30 words
A device as in claim 1 further including barrier means interposed between adjacent ones of said terminations for facilitating individual electrical connecting of said intermediate terminations to said collector means.
Claim 25
Dependent Claim
80 words
A device as in claim 3 in which said impedance network and said terminations are deposited to form a first layer on said substrate, said sealing means is deposited to form a second layer in overlying relation to said first layer for protectively encapsulating said network with said terminations extending laterally outward of said sealing means and in which said collector means, supported by said spacer means, forms a third layer in overlying, closely adjacent spaced relation to said terminations.
Claim 26
Dependent Claim
35 words
A device as in claim 1 further including electrically conductive means for bridging the space between said collector means and at least two selected intermediate terminations so as to fix the impedance of said device.
Claim 27
Dependent Claim
13 words
A device as in claim 25 wherein said electrically conductive means is solder.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |