Patent US2864747A successfully refreshed from Google Patents.
US2864747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Determination of hydrogen cyanide and hydrogen sulphide in air
Assignee: MSA Safety Inc
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Filing: 1954-04-21
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Granted: 1958-12-16
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Expires: 1974-04-21
Abstract
No abstract record available.
Inventors
- 👤 Harold H Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:43
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/4162
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
THAT METHOD OF DETERMINING A COMPOUND OF THE CLASS CONSISTING OF HYDROGEN CYANIDE AND HYDROGEN SULPHIDE IN AIR COMPRISING FLOWING THE AIR THROUGH AN ABSORBING LIQUID HAVING A PH OF AT LEAST 10 IN MEANS TO PRODUCE A SOLUTION OF THE COMPOUND CONTAINED IN THE AIR IN SAID ABSORBING LIQUID, THEN PASSING THE RESULTING SOLUTION TO A SILVER ELECTRODE HALF-CELL ASSOCIATED ELECTRICALLY WITH A REFERENCE ELECTRODE, ROTATING SAID SILVER ELECTRODE AT A VELOCITY OF ABOUT 1725 R.P.M. TO EFFECT RELATIVE MOVEMENT AT HIGH VELOCITY BETWEEN SAID SILVER ELECTRODE AND SAID SOLUTION, AND APPLYING THE E.M.F. DEVELOPED BY SAID CELL TO MEANS RESPONSIVE THERETO TO INDICATE THE CONCENTRATION OF SAID COMPOUND IN THE AIR TESTED.
Claim 2
Dependent Claim
114 words
THAT METHOD OF DETERMINING A COMPOUND OF THE CLASS CONSISTING OF HYDROGEN CYANIDE AND HYDROGEN SULPHIDE IN AIR COMPRISING FLOWING THE AIR THROUGH AN ABSORBING LIQUID HAVING A PH OF AT LEAST 10 IN MEANS TO PRODUCE A SOLUTION OF THE COMPOUND CONTAINED IN THE AIR IN SAID ABSORBING LIQUID, THEN PASSING THE RESULTING SOLUTION TO A SILVER ELECTRODE HALF-CELL ASSOCIATED ELECTRICALLY WITH A REFERENCE ELECTRODE, ROTATING SAID SILVER ELECTRODE AT A VELOCITY OF ABOUT 1725 R.P.M. TO EFFECT RELATIVE MOVEMENT AT HIGH VELOCITY BETWEEN SAID SILVER ELECTRODE AND SAID SOLUTION, AND APPLYING THE E.M.F. DEVELOPED BY SAID CELL TO MEANS RESPONSIVE THERETO TO INDICATE THE CONCENTRATION OF SAID COMPOUND IN THE AIR TESTED.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |