US3408477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detector and system for removing ice and snow
Assignee: Swiss Controls & Research Inc
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Filing: 1966-02-28
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Granted: 1968-10-29
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Expires: 1986-02-28
Abstract
No abstract record available.
Inventors
- 👤 Wilhelm K Kolster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:52
CPC Classifications
G; G01; G01W; G01W1/00; G01W1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
IN A SYSTEM FOR DETECTING AN ACCUMULATION OF ICE AND SNOW AND CONTROLLING THE OPERATION OF A HEATING MEANS FOR REMOVING THE SAME FROM AN EXPOSED SURFACE, THE COMBINATION OF A RELAY FOR CONTROLLING THE OPERATION OF SAID HEATING MEANS, A FIRST SENSOR RESPONSIVE TO AMBIENT TEMPERATURE, A SECOND SENSOR RESPONSIVE TO ACCUMULATION OF MOISTURE, A PAIR OF ELECTRONIC VALVES, ELECTRICAL CIRCUIT MEANS FOR TRIGGERING ONE OF SAID VALVES INTO CONDUCTIVE AND NON-CONDUCTIVE CONDITION IN RESPONSE TO OPERATION OF ONE OF SAID SENSORS, THE SECOND OF SAID VALVES AND SAID RELAY BEING CONNECTED IN THE CONDUCTIVE PATH OF SAID FIRST VALVE, AND CIRCUIT MEANS FOR TRIGGERING SAID SECOND VALVE INTO CONDUCTIVE AND NON-CONDUCTIVE CONDITION IN RESPONSE TO OPERATION OF THE OTHER OF SAID SENSORS, WHEREBY SAID RELAY IS ENERGIZED UPON TRIGGERING BOTH SAID VALVES INTO
Claim 2
Dependent Claim
135 words
IN A SYSTEM FOR DETECTING AN ACCUMULATION OF ICE AND SNOW AND CONTROLLING THE OPERATION OF A HEATING MEANS FOR REMOVING THE SAME FROM AN EXPOSED SURFACE, THE COMBINATION OF A RELAY FOR CONTROLLING THE OPERATION OF SAID HEATING MEANS, A FIRST SENSOR RESPONSIVE TO AMBIENT TEMPERATURE, A SECOND SENSOR RESPONSIVE TO ACCUMULATION OF MOISTURE, A PAIR OF ELECTRONIC VALVES, ELECTRICAL CIRCUIT MEANS FOR TRIGGERING ONE OF SAID VALVES INTO CONDUCTIVE AND NON-CONDUCTIVE CONDITION IN RESPONSE TO OPERATION OF ONE OF SAID SENSORS, THE SECOND OF SAID VALVES AND SAID RELAY BEING CONNECTED IN THE CONDUCTIVE PATH OF SAID FIRST VALVE, AND CIRCUIT MEANS FOR TRIGGERING SAID SECOND VALVE INTO CONDUCTIVE AND NON-CONDUCTIVE CONDITION IN RESPONSE TO OPERATION OF THE OTHER OF SAID SENSORS, WHEREBY SAID RELAY IS ENERGIZED UPON TRIGGERING BOTH SAID VALVES INTO
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) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |