Patent US3511976A successfully refreshed from Google Patents.
Patent US4150233A successfully refreshed from Google Patents.
US4150233A
Expired / Lapsed
US
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Water-soluble tetraphenylpyridinium salt for use as an analytical reagents
Assignee: Individual
•
Filing: 1977-05-16
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Granted: 1979-04-17
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Expires: 1997-05-16
Abstract
Abstract This invention relates to a new water-soluble, tetraphenyl substituted pyridinium salt compound and to a novel process of producing it. This compound finds use as a selective analytical reagent for certain large anions of low charge density.
Inventors
- 👤 Thomas C. Chadwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:20
CPC Classifications
C; C07; C07D; C07D309/00; C07D309/16; C07D309/18; C07C; C07C49/00; C07C49/76; C07C49/794; C07C49/796; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/16; C07D213/20; Y; Y10; Y10T; Y10T436/00; Y10T436/19
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
4 words
The compound 1,2,4,6-tetraphenylpyridinium acetate.
Claim 2
Dependent Claim
4 words
The compound 1,2,4,6-tetraphenylpyridinium acetate.
Claim 3
Dependent Claim
11 words
The compound according to claim 1 in solution in a solvent.
Claim 4
Dependent Claim
49 words
A method for the synthesis of the water-soluble pyridinium salt of claim 1, comprising the mixing of aniline, 1,3,5-triphenyl-2-penten-1,5-dione and acetic acid, heating the resulting mixture for a time necessary to complete the formation of the product, and work up of the reaction mixture by dilution with a solvent.
Claim 5
Dependent Claim
39 words
The method according to claim 3 wherein workup of the reaction mixture by dilution with a solvent is followed by neutralizaton with a base from the group comprising carbonates, oxides, or hydroxides of the group 1a and 2a elements.
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) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |