Patent US3022141A successfully refreshed from Google Patents.
US3022141A
Expired / Lapsed
US
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Small testing tubes having three or more separately arranged reagents or reagent layers
Assignee: Draegerwerk AG and Co KGaA
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Filing: 1960-04-28
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Granted: 1962-02-20
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Expires: 1980-04-28
Abstract
No abstract record available.
Inventors
- 👤 Grosskopf Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:20
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/24; Y; Y10; Y10T; Y10T436/00; Y10T436/21; Y10T436/214
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A SMALL TESTING TUBE FOR THE DETECTION OF METHANE IN ARI COMPRISING AT LEAST THREE SEPARTELY POSITIONED REAGENTS IN SAID TUBE, AT LEAST ONE OF SAID REAGENTS CONSISTING OF A MIXTURE OF SULPHURIC ACID AND SALTS OF PERMANGANIC ACID BEING PLACED IN A BREAKABLE AMPOULE WITHIN SAID TESTING TUBE AND POSITIONED IN SERIES WITH THE OTHER OF SAID REAGENTS RELATIVE TO THE INFLOW OF TESTED AIR WHEREBY CHARGED WITH SULPHUR TRIOXIDE AND THE LAST IN THE SERIES IS A CARBON MONOXIDE INDICATING REAGENT, AND SAID TESTING TUBE BEING PROVIDED WITH FRACTURE LINE MEANS ENCASED WITHIN TIGHT-FITTING IMPERVIOUS TUBULAR SLEEVE MEANS IN THE AREA OF SAID AMPOULE POSITIONING.
Claim 2
Dependent Claim
107 words
A SMALL TESTING TUBE FOR THE DETECTION OF METHANE IN ARI COMPRISING AT LEAST THREE SEPARTELY POSITIONED REAGENTS IN SAID TUBE, AT LEAST ONE OF SAID REAGENTS CONSISTING OF A MIXTURE OF SULPHURIC ACID AND SALTS OF PERMANGANIC ACID BEING PLACED IN A BREAKABLE AMPOULE WITHIN SAID TESTING TUBE AND POSITIONED IN SERIES WITH THE OTHER OF SAID REAGENTS RELATIVE TO THE INFLOW OF TESTED AIR WHEREBY CHARGED WITH SULPHUR TRIOXIDE AND THE LAST IN THE SERIES IS A CARBON MONOXIDE INDICATING REAGENT, AND SAID TESTING TUBE BEING PROVIDED WITH FRACTURE LINE MEANS ENCASED WITHIN TIGHT-FITTING IMPERVIOUS TUBULAR SLEEVE MEANS IN THE AREA OF SAID AMPOULE POSITIONING.
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) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |