US3830656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistor film
Assignee: Individual
•
Filing: 1971-06-25
•
Granted: 1974-08-20
•
Expires: 1991-06-25
Abstract
Abstract Coatings of a dispersion of carbon black or silver dust in a cellulose acetate resin or a polyurethane resin are locally formed on an electrical resistor film consisting of a cellulose acetate resin base having dispersed therein carbon black to give a local variation in the resistivity or to give terminals providing good electrical contact to the metallic electrodes of an electrical source. A process for forming said coatings is also disclosed.
Inventors
- 👤 H Takenaka
- 👤 T Okiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:13
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/003; H01C7/005; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24909; Y10T428/31504; Y10T428/31551; Y10T428/31591; Y10T428/31609; Y10T428/31678; Y10T428/31703
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
26 words
The resistor film as claimed in claim 1 wherein said conductive material is selected from the group consisting of carbon black, graphite powder and silver dust.
Claim 2
Dependent Claim
46 words
The resistor film as claimed in claim 1 wherein said local coating is a resistor coating for varying the local resistivity of the film base and said electrically conductive material dispersed in the coating is selected from the group consisting of carbon black and graphite powder.
Claim 3
Dependent Claim
28 words
The resistor film as claimed in claim 1 wherein said local coating is an electrode terminal and said electrically conductive material dispersed in the coating is silver dust.
Claim 4
Dependent Claim
37 words
The resistor film as claimed in claim 1 wherein the proportion of said electrically conductive material dispersed in said binder is from about 1 to about 50 percent by weight, based on the weight of the binder.
Claim 5
Dependent Claim
21 words
The resistor film as claimed in claim 1 wherein said resistor base film has a thickness of at least 200 microns.
Claim 6
Dependent Claim
29 words
The resistor film as claimed in claim 1 wherein both a resistor coating an an electrode terminal are formed on selected areas of the surface of said base film.
Claim 7
Dependent Claim
102 words
A resistor film consisting essentially of a resistor base film comprising a plasticized cellulose acetate resin having dispersed therein from about 1 to about 20 percent by weight, based on the weight of the resin, of an electrically conductive material and at least one local coating formed on selected areas of the surface of said base film, said coating comprising a binder selected from the group consisting of a cellulose acetate resin, a polyurethane resin and a mixture thereof having dispersed therein an electrically conductive material, whereby the resistivity of said base film can be varied to obtain a large current capacity.
Claim 8
Dependent Claim
16 words
The resistor film as claimed in claim 8 wherein said binder is a cellulose acetate resin.
Claim 9
Dependent Claim
15 words
The resistor film as claimed in claim 8 wherein said binder is a polyurethane resin.
Claim 10
Dependent Claim
23 words
The resistor film as claimed in claim 8 wherein said binder is a mixture of a cellulose acetate resin and a polyurethane resin.
Claim 11
Dependent Claim
110 words
Process for manufacturing a resistor film which comprises: forming a resistor base film by solution casting an organic solvent solution of a plasticized cellulose acetate resin having dispersed therein from about 1 to about 20 percent by weight, based on the weight of the resin, of an electrically conductive material, and coating selected areas of the surface of said base film by solution casting, while masking the remaining areas of the surface, with a material comprising a binder selected from the group consisting of a cellulose acetate resin, a polyurethane resin, and mixtures thereof, having dispersed therein an electrically conductive material, whereby the resistor film comprises coated and uncoated areas.
References Cited (Backward Citations)
US2282832A
Cited
US2543536A
Cited
US2866057A
Cited
US2901467A
Cited
US2982934A
Cited
US3192287A
Cited
US3310533A
Cited
US3335030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |