US3377462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for heating surfaces subject to strong mechanical stresses or considerably varying atmospheric conditions
Assignee: Individual
•
Filing: 1965-01-05
•
Granted: 1968-04-09
•
Expires: 1985-01-05
Abstract
No abstract record available.
Inventors
- 👤 Pferschy Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:52
CPC Classifications
E; E01; E01C; E01C11/00; E01C11/24; E01C11/26; E01C11/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A DEVICE FOR HEATING SURFACES SUBJECT TO STRONG MECHANICAL STRESSES OR CONSIDERABLY VARYING ATMOSPHERIC CONDITIONS, SUCH AS ROADS, AIRPORT RUNWAYS, BRIDGES OR OTHER TRAFFIC AREAS, SAID DEVICE COMPRISING A FOUNDATION LAYER AND AT LEAST ONE COATING COVERING SAID FOUNDATION LAYER, SAID COATING COMPRISING A HEATING ELEMENT OF AT LEAST ONE LAYER OF CONCRETE WHICH IS UNIFORMLY ELECTRICALLY CONDUCTIVE THROUGHOUT THE ENTIRE LAYER, AND MEANS IN CONTACT WITH SAID CONDUCTIVE CONCRETE LAYER FOR CONNECTING THE LATTER TO A SOURCE OF ELECTRICAL ENERGY.
Claim 2
Independent Claim
81 words
A DEVICE FOR HEATING SURFACES SUBJECT TO STRONG MECHANICAL STRESSES OR CONSIDERABLY VARYING ATMOSPHERIC CONDITIONS, SUCH AS ROADS, AIRPORT RUNWAYS, BRIDGES OR OTHER TRAFFIC AREAS, SAID DEVICE COMPRISING A FOUNDATION LAYER AND AT LEAST ONE COATING COVERING SAID FOUNDATION LAYER, SAID COATING COMPRISING A HEATING ELEMENT OF AT LEAST ONE LAYER OF CONCRETE WHICH IS UNIFORMLY ELECTRICALLY CONDUCTIVE THROUGHOUT THE ENTIRE LAYER, AND MEANS IN CONTACT WITH SAID CONDUCTIVE CONCRETE LAYER FOR CONNECTING THE LATTER TO A SOURCE OF ELECTRICAL ENERGY.
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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) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |