Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 6624328 | Preparation of perfluorinated vinyl ethers having a sulfonyl fluoride end-group A method is provided for making a perfluorinated vinyl ether having a sulfonyl fluoride end-group according to the formula FSO2 --(CF2)n --O--CF.dbd.CF2, where n is 2-5, comprising the steps of: a) fluorination ... | 09/23/2003 |
| 6506286 | Reactant, compound and process for the perfluoroalkylation of a nucleophile, and the derivatives obtained A reagent comprising a compound of formula (I): Rf --M(X)(Z)n --Y--R, wherein R is a hydrocarbon radical advantageously having at most 10 carbon atoms and being selected from alkyls and aryls; Rf is a radical of formula II... | 01/14/2003 |
| 6203670 | Method for grafting a substituted difluoromethyl group Provided is a process for grafting a substituted difluoromethyl group onto a compound bearing at least one electrophilic substituent, comprising (i) contacting the compound bearing at least one electrophilic substituent with a nucleophilic reagent which c... | 03/20/2001 |
| 6156163 | Reactant, compound and process for the perfluoroalkylation of the nucleophile, and the derivatives obtained A reagent comprising a compound of formula (I): Rf --M(X) (Z)n --Y--R, wherein R is a hydrocarbon radical advantageously having at most 10 carbon atoms and being selected from alkyls and aryls; Rf is a radical of formula I... | 12/05/2000 |
| 5601184 | Method and apparatus for use in photochemically oxidizing gaseous volatile or semi-volatile organic compounds An apparatus for photochemically oxidizing gaseous volatile or semi-volatile organic compounds includes: a) a reactor vessel having a plurality of reaction chambers provided therein, the reaction chambers having respective chamber lining sidewalls; b) a s... | 02/11/1997 |
| 4997988 | Oxa-organic sulfur compounds, their preparation and use Oxa-organic sulfur compounds, methods of preparing such compounds and methods of using the compounds as polymer chain length terminating agents are provided. The compounds are prepared by reacting allyl alcohol in the presence of a basic catalyst with a c... | 03/05/1991 |
| 4837364 | Processes for preparing pentafluoroethoxy- and pentafluoroethylthiobenzene drivatives A process for the preparation of (pentafluoroethoxy)- and (pentafluoroethylthio)benzene derivatives either from phenol, thiophenol or from halobenzene. A halobenzene is reacted with trifluoroethanol or a phenol or a thiophenol is reacted with a compound o... | 06/06/1989 |
| 4643811 | Photochemical process for the preparation of dichlorotrifluoroethoxy- and dichlorotrifluoroethlythiobenzene derivatives A process for the preparation of 1,1-dichloro-2,2,2-trifluoroethoxybenzene derivatives or 1,1-dichloro-2,2,2-trifluoroethylthiobenzene derivatives. A 2,2,2-trifluoroethoxybenzene or a 2,2,2-trifluoroethylthiobenzene derivative is brought into contact with... | 02/17/1987 |
| 4331821 | Process for the monohalogenation of alkylbenzenes in the -position and new alkylbenzenes monohalogenated in the -position A process for the monohalogenation of alkylbenzenes in the -position is disclosed wherein an alkylbenzene reactant containing a hydrogen atom in the -position is contacted with a halogen and the reaction mixture is withdrawn such that the am... | 05/25/1982 |
| 4101557 | Selective synthesis of 2-haloalkanethiols and episulfides therefrom Haloalkanethiols are synthesized through the free radical liquid phase reaction of halogenated olefins with an excess of hydrogen sulfide. High product yields to the desired haloalkanethiol products are secured when a 3 to 20 fold molar excess of hydrogen... | 07/18/1978 |
| 4046656 | Photochlorination process for methyl aromatic compounds The rate of photochlorination of methyl aromatic compounds, such as toluene, cresol, xylene, toluenesulfonyl chloride, methylnaphthalene, diphenylmethane, etc., is increased when carried out in the presence of bromine.... | 09/06/1977 |
| 4025406 | Photochemical method for chlorine isotopic enrichment An isotopic starting material consisting of a mixture of chlorine-35 and chlorine-37 isotopic species of an isotopic compound having the formula CYClX, wherein Y is O or S and X is Cl or F, such as thiophosgene, is selectively isotopically enriched by mea... | 05/24/1977 |
| 4022812 | Fire resistive plasticizer and method A fire resistive primary plasticizer having 15-70% chlorine, 1-8% sulphur, with the remainder formed principally of carbon, hydrogen and oxygen prepared by the reaction of a substantially straight chain paraffin by the reactions of sulphochlorination, chl... | 05/10/1977 |
| 3992289 | Method for production of sulfhydryl compounds using ultra-violet radiation An improved process is disclosed for production of sulfhydryl-terminated compounds by reaction of an allene and hydrogen sulfide initiated with ultraviolet light of wavelength above about 2600 Angstroms to obtain a colorless product of improved purity. Th... | 11/16/1976 |
| 3992274 | Sensitized production of sulfhydryl compounds using ultra violet radiation An improved process for production of sulfhydryl-terminated compounds by reaction of an allene compound and hydrogen sulfide is disclosed wherein the reaction is carried out in the presence of ultraviolet light of wavelength substantially above 2600 Angst... | 11/16/1976 |
