US3597720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wiper arm and potentiometer comprising the same
Assignee: Gulf & Western Ind Prod Co
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Filing: 1969-09-05
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Granted: 1971-08-03
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Expires: 1989-09-05
Abstract
Abstract An improved wiper arm for a potentiometer having bonded at least to the wiping end thereof, an electrically conductive, synthetic, resinous polymerizate, formed in situ by curing with an epoxy curing agent, a composition containing about 25 to 40 weight percent of an epoxy resin, about 40 to 70 weight percent finely divided silver, and about 5 to 20 weight percent finely divided carbon.
Inventors
- 👤 Lester E Burgess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:09
CPC Classifications
H; H01; H01C; H01C10/00; H01C10/30; H01C1/00; H01C1/12; H01C10/305; H01C10/306
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
111 words
In a wiper arm, for use with a potentiometer having an electrical resistance element, said arm having a fixed end adapted for connection to a terminal and a free end adapted to contact selectable portions of said resistance element, and said arm being operative to provide an electron-conducting path between said fixed and free ends: the improvement comprising an electron-conducting, synthetic resinous polymerizate bonded to at least the free end of said arm, said polymerizate being formed in situ by curing with an epoxy curing agent, a composition containing about 25-40 weight percent of epoxy resin, about 40-70 weight percent finely divided silver and about 5-20 weight percent finely divided carbon.
Claim 2
Dependent Claim
111 words
In a wiper arm, for use with a potentiometer having an electrical resistance element, said arm having a fixed end adapted for connection to a terminal and a free end adapted to contact selectable portions of said resistance element, and said arm being operative to provide an electron-conducting path between said fixed and free ends: the improvement comprising an electron-conducting, synthetic resinous polymerizate bonded to at least the free end of said arm, said polymerizate being formed in situ by curing with an epoxy curing agent, a composition containing about 25-40 weight percent of epoxy resin, about 40-70 weight percent finely divided silver and about 5-20 weight percent finely divided carbon.
Claim 3
Dependent Claim
21 words
The wiper arm as defined in claim 1, wherein said polymerizate is bonded to substantially the entire surface of said arm.
Claim 4
Dependent Claim
25 words
The wiper arm as defined in claim 1, wherein said polymerizate is bonded only to a localized portion of the free end of said arm.
Claim 5
Dependent Claim
35 words
The wiper arm as defined in claim 1 in which said polymerizate is an epoxy resin cured with 2-ethyl-4-methyl imidazole and having an epoxy equivalent weight within the range of about 175 to about 200.
Claim 6
Dependent Claim
12 words
The wiper arm as defined in claim 1, formed of spring steel.
Claim 7
Dependent Claim
114 words
In a potentiometer having an electrical resistance element and a wiper arm having a fixed end connected to a terminal and a free end in contact with a selectable portion of said resistance element, said wiper arm being operative to provide an electron-conducting path between said fixed and free ends: the improvement comprising an electron conducting, synthetic resinous polymerizate bonded to at least the free end of said arm where it contact said resistance element, said polymerizate being formed in situ by curing, with an epoxy curing agent, a composition containing about 25-40 weight percent of an epoxy resin, about 40-70 weight percent finely divided silver and about 5-20 weight percent finely divided carbon.
Claim 8
Dependent Claim
114 words
In a potentiometer having an electrical resistance element and a wiper arm having a fixed end connected to a terminal and a free end in contact with a selectable portion of said resistance element, said wiper arm being operative to provide an electron-conducting path between said fixed and free ends: the improvement comprising an electron conducting, synthetic resinous polymerizate bonded to at least the free end of said arm where it contact said resistance element, said polymerizate being formed in situ by curing, with an epoxy curing agent, a composition containing about 25-40 weight percent of an epoxy resin, about 40-70 weight percent finely divided silver and about 5-20 weight percent finely divided carbon.
Claim 9
Dependent Claim
20 words
The potentiometer as defined in claim 6 wherein said polymerizate is bonded to substantially the entire surface of said arm.
Claim 10
Dependent Claim
34 words
The potentiometer as defined in claim 6 wherein said Polymerizate is bonded only to a localized portion of the free end of said arm, and is interposed between said arm and said resistance element.
Claim 11
Dependent Claim
34 words
The potentiometer as defined in claim 6 in which said polymerizate is an epoxy resin cured with 2-ethyl-4-methyl imidazole and having an epoxy equivalent weight within the range of about 175 to about 200.
Claim 12
Dependent Claim
16 words
The potentiometer as defined in claim 6 wherein said wiper arm is formed of spring steel.
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |