Patent US2679569A successfully refreshed from Google Patents.
US2679569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically conductive film
Assignee: Electrofilm Corp
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Filing: 1951-08-25
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Granted: 1954-05-25
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Expires: 1971-08-25
Abstract
No abstract record available.
Inventors
- 👤 Ralph D Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:12
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/26; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T29/00; Y10T29/51; Y10T29/5124; Y10T29/5125; Y10T428/00; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A HEATING ELEMENT COMPRISING A BASE MATERIAL CARRYING A HARDENED AND DIMENSIONALLY STABILIZED THIN ELECTRICALLY CONDUCTIVE FILM HAVING RESISTIVE HEATING PROPERTIES AND COMPRISING AN INITIALLY FLUID BINDER CURED TO PERMANENTLY SOLID NON-CONDUCTIVE FORM AND CONTAINING UNIFORMLY DISTRIBUTED SOLID CONDUCTIVE FLAKY METAL PARTICLES HAVING RELATIVELY HIGHER TEMPERATURE COFFICIENT OF RESISTANCE ADMIXED UNIFORMLY WITH RESISTIVE FLAKY GRAPHITE PARTICLES HAVING LOWER TEMPERATURE COEFFICIENT OF RESISTANCE, SAID METAL PARTICLES BEING PREDOMINANTLY UNDER 40 MICRONS IN SIZE AND THE GRAPHITE PARTICLES BEING PREDOMINANTLY UNDER 10 MICRONS IN SIZE, AND SAID FILM RESULTING FROM CURING A QUANTITY OF THE BINDER WITH THE FLAKY METAL AND GRAPHITE PARTICLES IN INTERFITTING RELATION THEREIN SUFFICIENT TO PERMANENTLY SO MAINTAIN THE FLAKES IN THE BINDER.
Claim 2
Dependent Claim
115 words
A HEATING ELEMENT COMPRISING A BASE MATERIAL CARRYING A HARDENED AND DIMENSIONALLY STABILIZED THIN ELECTRICALLY CONDUCTIVE FILM HAVING RESISTIVE HEATING PROPERTIES AND COMPRISING AN INITIALLY FLUID BINDER CURED TO PERMANENTLY SOLID NON-CONDUCTIVE FORM AND CONTAINING UNIFORMLY DISTRIBUTED SOLID CONDUCTIVE FLAKY METAL PARTICLES HAVING RELATIVELY HIGHER TEMPERATURE COFFICIENT OF RESISTANCE ADMIXED UNIFORMLY WITH RESISTIVE FLAKY GRAPHITE PARTICLES HAVING LOWER TEMPERATURE COEFFICIENT OF RESISTANCE, SAID METAL PARTICLES BEING PREDOMINANTLY UNDER 40 MICRONS IN SIZE AND THE GRAPHITE PARTICLES BEING PREDOMINANTLY UNDER 10 MICRONS IN SIZE, AND SAID FILM RESULTING FROM CURING A QUANTITY OF THE BINDER WITH THE FLAKY METAL AND GRAPHITE PARTICLES IN INTERFITTING RELATION THEREIN SUFFICIENT TO PERMANENTLY SO MAINTAIN THE FLAKES IN THE BINDER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |