US2658819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring chemical activity, particularly of catalysts
Assignee: Individual
•
Filing: 1949-08-23
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Granted: 1953-11-10
•
Expires: 1969-08-23
Abstract
No abstract record available.
Inventors
- 👤 John M Formwalt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:00
CPC Classifications
G; G01; G01N; G01N7/00; G01N7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
APPARATUS FOR MEASURING THE ACTIVITY OF A CATALYST USED TO EVOLVE GAS FROM A CHEMICAL SUBSTANCE COMPRISING, A CYLINDRICAL REACTION CHAMBER FOR CONTAINING SAID CHEMICAL SUBSTANCE HAVING A THIN WALL AND A LENGTH LONG IN COMPARISON TO ITS DIAMETER, A TEMPERATURE COMPENSATED STRAIN GAUGE MOUNTED ON SAID WALL HAVING TWO RESISTANCE WIRE ELEMENTS AT RIGHT ANGLES TO EACH OTHER FOR MEASURING CIRCUMFERENTIAL AND LONGITUDINAL STRAINS IN SAID WALL, MEANS FOR INTRODUCING SAID CATALYST INTO SAID CHAMBER, A BRIDGE CIRCUIT INCORPORATING SAID TWO RESISTANCE WIRE ELEMENTS AS TWO OF ITS ARMS, AND MEANS FOR INDICATING RESISTANCE UNBALANCE IN SAID BRIDGE CIRCUIT AFTER THE INTRODUCTION OF SAID CATALYST.
Claim 2
Dependent Claim
106 words
APPARATUS FOR MEASURING THE ACTIVITY OF A CATALYST USED TO EVOLVE GAS FROM A CHEMICAL SUBSTANCE COMPRISING, A CYLINDRICAL REACTION CHAMBER FOR CONTAINING SAID CHEMICAL SUBSTANCE HAVING A THIN WALL AND A LENGTH LONG IN COMPARISON TO ITS DIAMETER, A TEMPERATURE COMPENSATED STRAIN GAUGE MOUNTED ON SAID WALL HAVING TWO RESISTANCE WIRE ELEMENTS AT RIGHT ANGLES TO EACH OTHER FOR MEASURING CIRCUMFERENTIAL AND LONGITUDINAL STRAINS IN SAID WALL, MEANS FOR INTRODUCING SAID CATALYST INTO SAID CHAMBER, A BRIDGE CIRCUIT INCORPORATING SAID TWO RESISTANCE WIRE ELEMENTS AS TWO OF ITS ARMS, AND MEANS FOR INDICATING RESISTANCE UNBALANCE IN SAID BRIDGE CIRCUIT AFTER THE INTRODUCTION OF SAID CATALYST.
References Cited (Backward Citations)
US1976752A
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US2062609A
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US2365015A
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US2420148A
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US2500964A
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US2475387A
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US2509621A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |