US2663692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed indicator composition
Assignee: EF Drew and Co Inc
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Filing: 1949-09-02
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Granted: 1953-12-22
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Expires: 1969-09-02
Abstract
No abstract record available.
Inventors
- 👤 Joseph V Corso
- 👤 Richard C Ulmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:13
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/221
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A COMPOSITION FOR INDICATING COLOR CHANGES IN TITRATION CONSISTING ESSENTIALLY OF A MIXTURE OF ETHYL ORANGE, ALPHAZURINE A AND FUCHSIN RED, THE RATIO OF ALIPHAZURINE TO FUCHSIN BEING ABOUT 3 TO 1, DISSOLVED IN WATER IN THE AMOUNT OF 3.8 TO 4.7 GREAMS PER LITER THE ETHYL ORANGE BEING IN AN AMOUNT ABOUT EQUAL TO THE SUM OF THE AMOUNTS OF THE OTHER DYES PRESENT, THE COLOR THEREOF BEING GREEN AND CHANGING TO GRAY-PURPLE IN THE RANGE OF PH 4.3 TO 3.8.
Claim 2
Dependent Claim
82 words
A COMPOSITION FOR INDICATING COLOR CHANGES IN TITRATION CONSISTING ESSENTIALLY OF A MIXTURE OF ETHYL ORANGE, ALPHAZURINE A AND FUCHSIN RED, THE RATIO OF ALIPHAZURINE TO FUCHSIN BEING ABOUT 3 TO 1, DISSOLVED IN WATER IN THE AMOUNT OF 3.8 TO 4.7 GREAMS PER LITER THE ETHYL ORANGE BEING IN AN AMOUNT ABOUT EQUAL TO THE SUM OF THE AMOUNTS OF THE OTHER DYES PRESENT, THE COLOR THEREOF BEING GREEN AND CHANGING TO GRAY-PURPLE IN THE RANGE OF PH 4.3 TO 3.8.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |