Patents – Melvin Calvin

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US 2,511,667 CHEMICAL METHOD FOR CONCENTRATIN ISOTOPES OF CARBON – Melvin Calvin; Peter E. Yankwich; June 13, 1950 (to U.S. Atomic Energy Commission)
A chemical method for concentrating the isotopes of carbon by means of repeated decarboxylation and synthesis of certain phthallates or malonates is described in this patent.

US 2,602,047 METHOD OF CONCENTRATING ISOTOPIC CARBON – Melvin Calvin; J. W. Weigl; July 1, 1952 (to U.S. Atomic Energy Commission)
This process of enriching CO2 with respect to the heavy isotopes of carbon contained therein comprises contacting CO2, while present to the extent of 0.5 to 10 volume percent in admixture with an inert gas, with chlorophyllic plant life in a closed system, and subsequently separating CO2 enriched in the heavy isotope from the inert gas mixture.

US 2,856,418 SEPARATION PROCESS FOR TRANSURANIC ELEMENT AND COMPOUNDS THEREOF – Melvin Calvin; October 14, 1958 (to U. S. Atomic Energy Commission)
A process is presented for the separation of plutonium from uranium and fission products in an aqueous acidic solution by use of a chelating agent. The plutonium is maintained in the tetravalent state and the uranium in the hexavalent state, and the acidic concentration is adjusted to about 1 N bar. The aqueous solution is then contacted with a water-immiscible organic solvent solution and the chelating agent. The chelating agents covered by this invention comprise a group of compounds characterized as fluorinated beta-diketones.

US 2,894,805 SEPARATION PROCESS FOR ACTINIDE ELEMENTS AND COMPOUNDS THEREOF – L. B. Werner; I. Perlman; Melvin Calvin; July 14, 1959 (to U. S. Atomic Energy Commission)
This patent deals with the separation of americium and/or curium salts from lanthanum salt contained in an aqueous solution by contacting the latter, after adjustment of the pH to between 2 and 4.8, with an organic water immiscible solution of a fluorinated β-diketone; the americium and/or curium salt is selectively extracted as a chelate with the β-diketone. Americium and/or curium salt can also be separated by the same method from thorium salt contained in an aqueous solution, provided that the pH value is between 0.2 and 3; the thorium is chelated and extracted away from americium and curium.

US 4,427,511 PHOTO-INDUCED ELECTRON TRANSFER METHOD – Roland Wohlgemuth; Melvin Calvin; January 24, 1984
The efficiency of photo-induced electron transfer reactions is increased and the back transfer of electrons in such reactions is greatly reduced when a photo-sensitizer zinc porphyrin-surfactant and an electron donor manganese porphyrin-surfactant are admixed into phospho-lipid membranes. The phospholipids comprising said membranes are selected from phospholipids whose head portions are negatively charged. Said membranes are contacted with an aqueous medium in which an essentially neutral viologen electron acceptor is admixed. Catalysts capable of transferring electrons from reduced viologen electron acceptor to hydrogen to produce elemental hydrogen are also included in the aqueous medium. An oxidizable olefin is also admixed in the phospholipid for the purpose of combining with oxygen that coordinates with oxidized electron donor manganese porphyrin-surfactant.


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