Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Inventor
George William Johnson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IndividualfiledCriticalIndividual
Application grantedgrantedCritical
Publication of GB191100569ApublicationCriticalpatent/GB191100569A/en
569. Johnson, G. W., [Vereinigte Chininfabriken Zimmer & Co.]. Jan. 9. Hydro-cinchona alkaloids are prepared by the action of hydrogen upon cinchona alkaloids in the presence of a colloidal solution of a metal of the platinum group. In an example palladium dichloride and gum arabic dissolved in water are treated with hydrogen until the liquid becomes of a deep black colour, quinine hydrochloride is added, and the treatment with hydrogen continued until the theoretical quantity has been absorbed. Hydroquinidine, hydrocinchonine, and hydrocinchonidine can be similarly produced.
GB191100569D1911-01-091911-01-09Improvements in the Manufacture of Hydro-cinchona-alkaloids.
ExpiredGB191100569A
(en)
Reactivity and charge transfer at the tungsten oxide/sulfuric acid interfaces: Nonstoichiometric tungsten (VI, V) oxide films as powerful electroreduction catalysts
Improvements in and relating to sheets or surfaces for use in electrochemical recording means whereby a trace is produced from which instantaneous values as well as the rate of change of values can be deduced