Patent US2736638A successfully refreshed from Google Patents.
US2736638A
Expired / Lapsed
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⏱️ 0.0 years remaining
Detection of sulfur dioxide
Assignee: MSA Safety Inc
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Filing: 1953-07-14
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Granted: 1956-02-28
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Expires: 1973-07-14
Abstract
No abstract record available.
Inventors
- 👤 Paul W Mcconnaughey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:47
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; Y; Y10; Y10T; Y10T436/00; Y10T436/18; Y10T436/186
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
THAT METHOD OF DETERMINING SULFUR DIOXIDE PRESENT IN A GAS WHICH COMPRISES THE STEPS OF PASSING GAS TO BE TESTED THROUGH AN ELONGATE BODY OF CHEMICALLY INERT GRANULAR THROUGH AN ELONGATE BODY OF CHEMICALLY INERT METHYLDIAMINODIPHENYLMETHANE AND AN OXIDIZING AGENT OF THE GROUP CONSISTING OF DILUTE IODINE SOLUTION, DILUTE BROMINE SOLUTION AND DILUTE NITRIC ACID SOLUTION, WHICH PRODUCT UPON CONTACT WITH SULFUR DIOXIDE IS BLEACHED TO WHITE.
Claim 2
Dependent Claim
67 words
THAT METHOD OF DETERMINING SULFUR DIOXIDE PRESENT IN A GAS WHICH COMPRISES THE STEPS OF PASSING GAS TO BE TESTED THROUGH AN ELONGATE BODY OF CHEMICALLY INERT GRANULAR THROUGH AN ELONGATE BODY OF CHEMICALLY INERT METHYLDIAMINODIPHENYLMETHANE AND AN OXIDIZING AGENT OF THE GROUP CONSISTING OF DILUTE IODINE SOLUTION, DILUTE BROMINE SOLUTION AND DILUTE NITRIC ACID SOLUTION, WHICH PRODUCT UPON CONTACT WITH SULFUR DIOXIDE IS BLEACHED TO WHITE.
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) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |