Patent US2978352A successfully refreshed from Google Patents.
US2978352A
Expired / Lapsed
US
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Production of triarylmethane colors
Assignee: EIDP Inc
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Filing: 1957-07-25
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Granted: 1961-04-04
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Expires: 1977-07-25
Abstract
No abstract record available.
Inventors
- 👤 Clarke Ray Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:15
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; Y; Y10; Y10S; Y10S101/00; Y10S101/29
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A PROCESS OF CONVERTING INTO COLOR A COLORLESS TRIARYLMETHANE COMPOUND OF THE GROUP CONSISTING OF LEUCOTRIARYLMETHANES, TRIARYLMETHANE CARBINOLS, LOWER ALKYL ETHERS OF TRIARYLMETHANE CARBINOLS AND INNER CARBOXY ESTERS OF TRIARYLMETHANE CARBINOLS, WHICH COMPRISES REACTING SAID COLORLESS COMPOUND, IN THE ABSENCES OF OTHER OXIDIZING AGENTS, WITH A METAL FERRICYANIDE OF THE GROUP CONSISTING OF CUPRIC FERRICYANIDE, SILVER FERRICYANIDE, ZINC FERRICYANIDE, CADMIUM FERRICYANIDE AND MERCURIC FERRICYANIDE.
Claim 2
Dependent Claim
64 words
A PROCESS OF CONVERTING INTO COLOR A COLORLESS TRIARYLMETHANE COMPOUND OF THE GROUP CONSISTING OF LEUCOTRIARYLMETHANES, TRIARYLMETHANE CARBINOLS, LOWER ALKYL ETHERS OF TRIARYLMETHANE CARBINOLS AND INNER CARBOXY ESTERS OF TRIARYLMETHANE CARBINOLS, WHICH COMPRISES REACTING SAID COLORLESS COMPOUND, IN THE ABSENCES OF OTHER OXIDIZING AGENTS, WITH A METAL FERRICYANIDE OF THE GROUP CONSISTING OF CUPRIC FERRICYANIDE, SILVER FERRICYANIDE, ZINC FERRICYANIDE, CADMIUM FERRICYANIDE AND MERCURIC FERRICYANIDE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |