US3106458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for detecting nitrogen dioxide in gases
Assignee: Individual
•
Filing: 1961-11-27
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Granted: 1963-10-08
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Expires: 1981-11-27
Abstract
No abstract record available.
Inventors
- 👤 Grosskopf Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:43
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/177692; Y10T436/178459
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A PROCESS FOR THE SPECIFIC COLORIMETRIC DETERMINATION OF NITROGEN DIOXIDE GASES COMPRISING CONTACTING THE GASES RESPECTIVELY WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF TOLIDINE, BENZIDINE AND BENZIDINE DERIVATIVES, AN OXIDIZING AGENT AND A BENZIDINE DERIVATIVES, AND OBSERVING THE COLOR OF THE LATTER BENZIDINE DERIVATIVE WHICH CHANGES COLOR UPON CONTACT WITH NITROGEN DIOXIDE.
Claim 2
Dependent Claim
54 words
A PROCESS FOR THE SPECIFIC COLORIMETRIC DETERMINATION OF NITROGEN DIOXIDE GASES COMPRISING CONTACTING THE GASES RESPECTIVELY WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF TOLIDINE, BENZIDINE AND BENZIDINE DERIVATIVES, AN OXIDIZING AGENT AND A BENZIDINE DERIVATIVES, AND OBSERVING THE COLOR OF THE LATTER BENZIDINE DERIVATIVE WHICH CHANGES COLOR UPON CONTACT WITH NITROGEN DIOXIDE.
References Cited (Backward Citations)
US2963351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-10-07 | 1967-04-08 | 1967-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-07 | 1971-04-08 | 1971-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-07 | 1975-04-08 | 1975-10-08 | $7700.00 | Window Closed / Lapsed |