US3247478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical hygrometer
Assignee: AEROLOGICAL RES Inc
•
Filing: 1961-03-20
•
Granted: 1966-04-19
•
Expires: 1981-03-20
Abstract
No abstract record available.
Inventors
- 👤 Leo S Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:01
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
AN ELECTRICAL HYGROMETER COMPRISING A METALLIC CASE MEMBER HAVING A TEMPERATURE COEFFICIENT OF EXPANSION OF NOT GREATER THAN 15X10**-6 PARTS PER DEGREE C., AN INSULATING COATING OVER SAID BASE MEMBER OF BETWEEN 0.001 AND 0.004 INCH THICK, A CARBON COATING ON SAID INSULATING COATING, THE RESISTANCE OF SAID CARBON COATING BEING A FUNCTION OF RELATIVE HUMIDITY AND MEANS FOR MAKING ELECTTRICAL CONTACT WITH SAID CARBON COATING.
Claim 2
Dependent Claim
66 words
AN ELECTRICAL HYGROMETER COMPRISING A METALLIC CASE MEMBER HAVING A TEMPERATURE COEFFICIENT OF EXPANSION OF NOT GREATER THAN 15X10**-6 PARTS PER DEGREE C., AN INSULATING COATING OVER SAID BASE MEMBER OF BETWEEN 0.001 AND 0.004 INCH THICK, A CARBON COATING ON SAID INSULATING COATING, THE RESISTANCE OF SAID CARBON COATING BEING A FUNCTION OF RELATIVE HUMIDITY AND MEANS FOR MAKING ELECTTRICAL CONTACT WITH SAID CARBON COATING.
References Cited (Backward Citations)
US1422130A
Cited
US1819246A
Cited
US1881446A
Cited
US2179566A
Cited
US2285421A
Cited
US2481728A
Cited
US2701832A
Cited
US2943488A
Cited
US3026398A
Cited
US3058079A
Cited
US3045198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |