Patent US3138948A successfully refreshed from Google Patents.
US3138948A
Expired / Lapsed
US
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Hydrogen measuring system
Assignee: Engelhard Industries Inc
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Filing: 1960-09-13
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Granted: 1964-06-30
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Expires: 1980-09-13
Abstract
No abstract record available.
Inventors
- 👤 William C Pfefferle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:27
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
APPARATUS FOR MEASURING THE HYDROGEN CONTENT OF A GAS COMPRISING A SUPPORT MEMBER, A RESISTANCE ELEMENT MADE OF A PALLADIUM ALLOY AND MOUNTED ON THE SUPPORT MEMBER, A COATING OF A POROUS HEAT AND ELECTRICALLY INSULATING MATERIAL ON THE RESISTANCE ELEMENT AND COVERING IT, SAID COATING BEING SUFFICIENTLY POROUS TO PERMIT HYDROGEN IN A GAS TO COME IN CONTACT WITH THE RESISTANCE ELEMENT, MEANS FOR HEATING SAID ELEMENT AND MEANS FOR DETECTING VARIATIONS IN THE ELECTRICAL RESISTANCE OF SAID ELEMENT WITH CHANGES IN THE HYDROGEN CONTENT OF A GAS IN CONTACT WITH THE ELEMENT.
Claim 2
Dependent Claim
94 words
APPARATUS FOR MEASURING THE HYDROGEN CONTENT OF A GAS COMPRISING A SUPPORT MEMBER, A RESISTANCE ELEMENT MADE OF A PALLADIUM ALLOY AND MOUNTED ON THE SUPPORT MEMBER, A COATING OF A POROUS HEAT AND ELECTRICALLY INSULATING MATERIAL ON THE RESISTANCE ELEMENT AND COVERING IT, SAID COATING BEING SUFFICIENTLY POROUS TO PERMIT HYDROGEN IN A GAS TO COME IN CONTACT WITH THE RESISTANCE ELEMENT, MEANS FOR HEATING SAID ELEMENT AND MEANS FOR DETECTING VARIATIONS IN THE ELECTRICAL RESISTANCE OF SAID ELEMENT WITH CHANGES IN THE HYDROGEN CONTENT OF A GAS IN CONTACT WITH THE ELEMENT.
References Cited (Backward Citations)
US2080953A
Cited
US2866330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |