US3573427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically conductive asphaltic concrete
Assignee: United States Department of the Army
•
Filing: 1969-07-30
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Granted: 1971-04-06
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Expires: 1989-07-30
Abstract
Abstract The passage of an electric current through an electrically conductive asphaltic concrete surface generates sufficient heat within the surface to prevent the accumulation of snow and ice thereon. The asphaltic concrete is made electrically conductive by incorporating graphite particles within the concrete mix.
Inventors
- 👤 Louis David Minsk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:39
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
24 words
A method according to claim 1 wherein the current is passed through the electrical conductive asphaltic concrete by spaced-apart electrodes imbedded within the concrete.
Claim 2
Dependent Claim
18 words
A method according to claim 2 wherein the potential difference between the electrodes does not exceed 30 volts.
Claim 3
Dependent Claim
27 words
A method according to claim 3 wherein the power dissipated within said electrical conductive layer of asphaltic concrete ranges from 10 to 40 watts per square foot.
Claim 4
Dependent Claim
48 words
A method according to claim 4 wherein said electrically conductive asphaltic concrete consists of asphaltic concrete mixes having dispersed therein high purity graphite particles, said graphite particles constituting from 20 percent to 30 percent by weight of the mixture based on the total weight of the concrete aggregates.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |