Patent US3767519A successfully refreshed from Google Patents.
US3767519A
Expired / Lapsed
US
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Electrical conductive film
Assignee: Panasonic Holdings Corp
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Filing: 1972-01-31
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Granted: 1973-10-23
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Expires: 1992-01-31
Abstract
Abstract An electrically conductive film for use in printed circuits and the like. The film has a thermosetting binder which contains metal powder in flake form and metal powder in dendrite form dispersed therein. The metal powder in flake form is distributed more densely in the layer at the surface remote from the base on which the film is placed than in the layer at the surface of the film which is against the base.
Inventors
- 👤 M Wada
- 👤 K Kojima
- 👤 K Shimada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:11
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/12; B29C70/58; B29C70/64; B29C70/88; B29C70/882; H; H01; H01C; H01C17/00; H01C17/28; H01C17/281; H01C7/00; H01C7/02; H01C7/021; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H05K1/095; H10; H10D; H10D84/00; H10D84/01; B29K; B29K2995/00; B29K2995/0003; B29K2995/0005; B29L; B29L2007/00; B29L2007/008; H05K1/16; H05K1/167; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0347; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/29; Y10T428/2982; Y10T428/31504; Y10T428/31511
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
22 words
A conductive film as claimed in claim 1, wherein said metal powder in flake form has a floating ratio more than 60%.
Claim 2
Dependent Claim
53 words
A conductive film as claimed in claim 1, wherein said metal powder in flake form has flakes with a diameter across the flat surface of 1 to 10 microns and a thickness of 0.01 to 0.1 microns and said metal powder in dendrite from has particles form 10 to 15 microns in size.
Claim 3
Dependent Claim
60 words
A conductive film as claimed in claim 3, wherein said metal powder in flake form is present in an amount of 10 to 60 wt. percent of the total weight of the metal powder and said metal powder in dendrite form is present in an amount of 40 to 90 wt. percent of the total weight of the metal powder.
Claim 4
Dependent Claim
42 words
A conductive film as claimed in claim 4, wherein said conductive film has a composition consisting essentially of 10 to 50% by volume of thermosetting binder and 50 to 90% by volume of total metal powder in flake form and dendrite form.
Claim 5
Dependent Claim
30 words
A conductive film as claimed in claim 1, wherein the metal of said metal powder in flake form is one member selected from the group consisting of copper and silver.
Claim 6
Dependent Claim
30 words
A conductive film as claimed in claim 1, wherein the metAl of said metal powder in dendrite form is one member selected from the group consisting of copper and iron.
Claim 7
Dependent Claim
29 words
A conductive film as claimed in claim 1, wherein the metals of said metal powder in flake form and metal powder in dendrite form are silver and copper, respectively.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |