Patent US3380029A successfully refreshed from Google Patents.
US2855280A
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Colorimetric determination
Assignee: MSA Safety Inc
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Filing: 1956-06-15
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Granted: 1958-10-07
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Expires: 1976-06-15
Abstract
No abstract record available.
Inventors
- 👤 Paul W Mcconnaughey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:19
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/8483; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/172307
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN A PROCESS OF COLORIMETRIC DETECTION IN WHICH AN INDICATOR IS EXPOSED TO A MATERIAL UNDER TEST, THE STEPS COMPRISING SEPARATELY DEPOSITING IN NON-AQUEOUS FROM COMPONENTS OF SAID INDICATOR ON A CARRIER AS THE CARRIER IS WITHDRAWN FOR USE, SIMULTANEOUSLY DEPOSITING A LIQUID ON SAID CARRIER IN A LINE WITH THE DEPOSITS OF INDICATOR COMPONENTS BUT AT A POINT REMOTE FROM THE POINT OF DEPOSITION OF AT LEAST ONE OF SAID COMPONENTS OF SAID INDICATOR TO ACTIVATE SAID COMPONENTS FOR PROMPT REACTION WITH THE MATERIAL BEING DETECTED, AND THEN EXPOSING THE RESULTING INDICATOR CARRIER TO THE MATERIAL UNDER TEST.
Claim 2
Dependent Claim
127 words
APPARATUS FOR PREPARING AN INDICATOR FOR COLORIMETRIC ANALYSIS OF FLUIDS, THE APPARATUS COMPRISING A CASE PROVIDED WITH A DISPENSING SLOT, AN INDICATOR STRIP IN THE CASE ADAPTED TO BE DISPENSED THROUGH SAID SLOT, MEANS IN SAID CASE ADAPTED TO SUPPORT SAID TRIP, A ROD OF SOLID INDICATOR MATERIAL IN SAID CASE, MEANS IN SAID CASE TO FORCE AND END OF SAID ROD OF SOLID INDICATOR MATERIAL AGAINST THE STRIP AS IT IS MOVED OUT THROUGH SAID SLOT, AND MEANS IN SAID CASE SPACED LENGTHWISE OF THE STRIP FROM SAID ROD OF SOLID INDICATOR MATERIAL ADAPTED TO APPLY A LIQUID TO THE STRIP IN RESPONSE TO MOVEMENT OF THE STRIP TO MIX WITH INDICATOR MATERIAL, WHEREBY THE STRIP REMOVED FROM THE CASE CAN BE USED AS AN INDICATOR.
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) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |