US4350741A
Expired / Lapsed
US
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Resistor elements
Assignee: Panasonic Holdings Corp
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Filing: 1980-11-14
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Granted: 1982-09-21
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Expires: 2000-11-14
Abstract
Abstract Resistor elements made by co-molding of film-resistors comprising conductive powder and polyimide resin and a diallyl isophthalate substrate containing more than 500 ppm inhibitors have good thermal stability and smooth surfaces, and are especially suitable for long life potentiometers for high temperature uses.
Inventors
- 👤 Yo Hasegawa
- 👤 Shigeru Yasuda
- 👤 Kunio Kojima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:29
CPC Classifications
H; H01; H01C; H01C10/00; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06573; H01C17/06586; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
49 words
A method of producing a resistor element which comprises molding a resistor film comprising aromatic polyimide and conductive powder together with a substrate comprising diallyl isophthalate prepolymer, polymerization initiators, inorganic fillers and radical polymerization inhibitors wherein the amount of inhibitors is more than 500 ppm based on the prepolymer.
Claim 2
Independent Claim
49 words
A method of producing a resistor element which comprises molding a resistor film comprising aromatic polyimide and conductive powder together with a substrate comprising diallyl isophthalate prepolymer, polymerization initiators, inorganic fillers and radical polymerization inhibitors wherein the amount of inhibitors is more than 500 ppm based on the prepolymer.
Claim 3
Independent Claim
56 words
A method of producing a resistor element which comprises molding a resistor film comprising aromatic polyimide, conductive powder and boron nitride powder having the hexagonal system together with a substrate comprising diallyl isophthalate prepolymer, polymerization initiators, inorganic fillers and radical polymerization inhibitors wherein the amount of inhibitors is more than 500 ppm based on the prepolymer.
Claim 4
Independent Claim
56 words
A method of producing a resistor element which comprises molding a resistor film comprising aromatic polyimide, conductive powder and boron nitride powder having the hexagonal system together with a substrate comprising diallyl isophthalate prepolymer, polymerization initiators, inorganic fillers and radical polymerization inhibitors wherein the amount of inhibitors is more than 500 ppm based on the prepolymer.
Claim 5
Dependent Claim
19 words
The method of claim 2 where content of said boron nitride powder is 20-55 weight percent of resistor film.
Claim 6
Dependent Claim
10 words
The resistor element produced by the process of claim 1.
Claim 7
Dependent Claim
10 words
The resistor element produced by the process of claim 2.
Claim 8
Dependent Claim
10 words
The resistor element produced by the process of claim 3.
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) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |