US2637631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analytical reagent and method
Assignee: Individual
•
Filing: 1949-03-09
•
Granted: 1953-05-05
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Expires: 1969-03-09
Abstract
No abstract record available.
Inventors
- 👤 Gehauf Bernard
- 👤 Goldenson Jerome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:36
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/204998; Y10T436/205831
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A COMPOSITION OF MATTER CONSISTING OF AN ORGANIC COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
74 words
IN THE METHOD OF QUALITATIVELY DETERMINING THE PRESENCE OF CHEMICAL ELEMENTS IN A MEDIUM BY PRODUCING A COLOR CHANGE IN SAID MEDIUM, THE STEP WHICH COMPRISES ADDING P,P''-BIS-(DIMETHYLAMINO) THIOBENZOPHENONE TO A SOLUTION CONTAINING A SINGLE IONIC MEMBER OF THE GROUP CONSISTING OF MERCURY, CUPROUS COPPER, SILVER, GOLD, PLATINUM AND PALLADIUM IN A SUFFICIENT QUANTITY TO AFFIRM THE PRESENCE OF ONE OF SAID MEMBERS AND IDENTIFYING THE METAL BY THE RESULTANT COLOR OF THE SOLUTION.
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) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |