US2728639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detection of cyanides
Assignee: MSA Safety Inc
•
Filing: 1952-08-01
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Granted: 1955-12-27
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Expires: 1972-08-01
Abstract
No abstract record available.
Inventors
- 👤 Paul W Mcconnaughey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:51
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/223; G01N31/224; G01N21/00; G01N21/75; G01N21/77; G01N21/78; G01N21/783; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/172307
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A COLORIMETRIC REAGENT FOR A CYANIDE OF THE FORMULA RCN IN WHICH R CONSISTS OF H AND CH2=CH, SAID REAGENT BEING A SOLUTION OF O-TOLIDINE, A SALT OF THE GROUP CONSISTING OF COPPER SULFATE AND COPPER ACETATE, AND A POLYHYDRIC ALCOHOL.
Claim 2
Dependent Claim
41 words
A COLORIMETRIC REAGENT FOR A CYANIDE OF THE FORMULA RCN IN WHICH R CONSISTS OF H AND CH2=CH, SAID REAGENT BEING A SOLUTION OF O-TOLIDINE, A SALT OF THE GROUP CONSISTING OF COPPER SULFATE AND COPPER ACETATE, AND A POLYHYDRIC ALCOHOL.
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) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |