US3293901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dew point indicator
Assignee: Individual
•
Filing: 1964-07-13
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Granted: 1966-12-27
•
Expires: 1984-07-13
Abstract
No abstract record available.
Inventors
- 👤 James N Van Scoyoc
- 👤 Donald C Reukauf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:11
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/56; G01N25/66; G01N25/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
A DEW POINT INDICATOR COMPRISING: MEANS PROVIDING AN INSULATING SURFACE; A PAIR OF SPACED ELECTRODES ON SAID INSULATING SURFACE; NORMALLY OPERATIVE MEANS FOR COOLING SAID INSULATING SURFACE; A SUBSTANTIALLY CONSTANT VOLTAGE ALTERNATING CURRENT SOURCE; A CURRENT SENSING DEVICE AND A PAIR OF SUBSTANTIALLY EQUAL RESISTORS CONNECTED IN SERIES ACROSS SAID SOURCE, EACH RESISTOR HAVING A RESISTANCE VALUE COMPARABLE TO THE RESISTANCE BETWEEN SAID ELECTRODES WHEN THERE IS A FILM OF CONDENSED MOISTURE ON SAID INSULATING SURFACE; MEANS DIRECTLY CONNECTING SAID ELECTRODES TO THE ENDS OF ONE OF SAID RESISTORS; A GASEOUS DISCHARGE DEVICE CONNECTED IN SHUNT TO ONE OF SAID RESISTORS AND A SIMILAR GASEOUS DISCHARGE DEVICE CONNECTED IN SHUNT TO THE OTHER OF SAID RESISTORS, SAID DISCHARGE DEVICES HAVING FIRING VOLTAGES SOMEWHAT HIGHER THAN THE ALTERNATING VOLTAGES ACROSS SAID RESISTORS WHEN SAID INSULATING SURFACE IS DRY; MEANS INCLUDING SAID CURRENT SENSING DEVICE RESPONSIVE TO THE ALTERNATING CURRENT SUPPLIED BY SAID SOURCE FOR RENDERING SAID COOLING MEANS INOPERATIVE WHEN SAID CURRENT IS ABOVE A PREDETERMINED VALUE; AND MEANS FOR INDICATING THE AVERAGE TEMPERATURE OF SAID INSULATING SURFACE.
Claim 2
Dependent Claim
177 words
A DEW POINT INDICATOR COMPRISING: MEANS PROVIDING AN INSULATING SURFACE; A PAIR OF SPACED ELECTRODES ON SAID INSULATING SURFACE; NORMALLY OPERATIVE MEANS FOR COOLING SAID INSULATING SURFACE; A SUBSTANTIALLY CONSTANT VOLTAGE ALTERNATING CURRENT SOURCE; A CURRENT SENSING DEVICE AND A PAIR OF SUBSTANTIALLY EQUAL RESISTORS CONNECTED IN SERIES ACROSS SAID SOURCE, EACH RESISTOR HAVING A RESISTANCE VALUE COMPARABLE TO THE RESISTANCE BETWEEN SAID ELECTRODES WHEN THERE IS A FILM OF CONDENSED MOISTURE ON SAID INSULATING SURFACE; MEANS DIRECTLY CONNECTING SAID ELECTRODES TO THE ENDS OF ONE OF SAID RESISTORS; A GASEOUS DISCHARGE DEVICE CONNECTED IN SHUNT TO ONE OF SAID RESISTORS AND A SIMILAR GASEOUS DISCHARGE DEVICE CONNECTED IN SHUNT TO THE OTHER OF SAID RESISTORS, SAID DISCHARGE DEVICES HAVING FIRING VOLTAGES SOMEWHAT HIGHER THAN THE ALTERNATING VOLTAGES ACROSS SAID RESISTORS WHEN SAID INSULATING SURFACE IS DRY; MEANS INCLUDING SAID CURRENT SENSING DEVICE RESPONSIVE TO THE ALTERNATING CURRENT SUPPLIED BY SAID SOURCE FOR RENDERING SAID COOLING MEANS INOPERATIVE WHEN SAID CURRENT IS ABOVE A PREDETERMINED VALUE; AND MEANS FOR INDICATING THE AVERAGE TEMPERATURE OF SAID INSULATING SURFACE.
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |