Patent US2749874A successfully refreshed from Google Patents.
Patent US3227951A successfully refreshed from Google Patents.
US3227951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical device for capacitively measuring the thickness of a layer of fluid
Assignee: Individual
•
Filing: 1961-02-17
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Granted: 1966-01-04
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Expires: 1981-02-17
Abstract
No abstract record available.
Inventors
- 👤 David E Dykaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:01
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/02; G01B7/06; G01B7/08; G01B7/085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A DEVICE FOR MEASURING THE THICKNESS OF A FIRST FILM OF LIQUID WHICH HAS A DIELECTRIC CONSTANT DIFFERENT FROM AIR WHICH IS DISPOSED ON A FIRST ROLLER AND WHICH HAS DIELECTRIC PROPERTIES, COMPRISING CAPACITIVE TRANSDUCER HAVING A PAIR OF INSULATED CONDUCOTRS HAVING A RELATIVELY FIXED SPACING THEREBETWEEN, ONE OF SAID CONDUCTORS COMPRISING A SECOND ROLLERS HAVING A PERIPHERAL SURFACE DISPOSED OPPOSITE THE OTHER CONDUCTOR, SAID SECOND ROLLER ENGAGING SAID FIRST FILM TO BE DRIVEN BY SAID FIRST ROLLER AND TO HAVE DEPOSITED THEREREON A SECOND FILM OF SAID LIQUID FROM SAID FIRST ROLLER, THE THICKNESS OF SAID SECOND FILM BEING PROPORTIONAL TO THE THICKNESS OF SAID FIRST FILM; AND A CAPACITANCE METER CONNECTED TO SAID CONNECTORS AND RESPONSIVE TO CHANGES IN THE CAPACITANCE OF THE TRANSDUCERS AS EFFECTED BY CHANGES IN THE THICKNESS OF THE DEPOSITED
Claim 2
Independent Claim
136 words
A DEVICE FOR MEASURING THE THICKNESS OF A FIRST FILM OF LIQUID WHICH HAS A DIELECTRIC CONSTANT DIFFERENT FROM AIR WHICH IS DISPOSED ON A FIRST ROLLER AND WHICH HAS DIELECTRIC PROPERTIES, COMPRISING CAPACITIVE TRANSDUCER HAVING A PAIR OF INSULATED CONDUCOTRS HAVING A RELATIVELY FIXED SPACING THEREBETWEEN, ONE OF SAID CONDUCTORS COMPRISING A SECOND ROLLERS HAVING A PERIPHERAL SURFACE DISPOSED OPPOSITE THE OTHER CONDUCTOR, SAID SECOND ROLLER ENGAGING SAID FIRST FILM TO BE DRIVEN BY SAID FIRST ROLLER AND TO HAVE DEPOSITED THEREREON A SECOND FILM OF SAID LIQUID FROM SAID FIRST ROLLER, THE THICKNESS OF SAID SECOND FILM BEING PROPORTIONAL TO THE THICKNESS OF SAID FIRST FILM; AND A CAPACITANCE METER CONNECTED TO SAID CONNECTORS AND RESPONSIVE TO CHANGES IN THE CAPACITANCE OF THE TRANSDUCERS AS EFFECTED BY CHANGES IN THE THICKNESS OF THE DEPOSITED
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) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |