Patents by Inventor Donald Richard Randell
Donald Richard Randell has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5977330Abstract: Chitosan derivatives having structural units of formula I, II and III in random distribution ##STR1## wherein the substituents R.sub.1 are each, independently of one another, H or --Z--R.sub.2 --X, R.sub.3 is H or acetyl, Y is the anion O--Z--R.sub.2 --X, and(a) Z is --CO-- or --SO.sub.2 --, X is --CO.sub.2 H, --CH.sub.2 CO.sub.2 H or --CH.sub.2 PO(OH).sub.2, and R.sub.2 is --CHR.sub.4 CR.sub.5 (OH)--, R.sub.4 is --H, --OH, C.sub.1 -C.sub.4 alkoxy or C.sub.1 -C.sub.4 alkyl, and R.sub.5 is H or C.sub.1 -C.sub.4 alkyl, or(b) Z is --CO--, X is --CO.sub.2 H, and R.sub.2 is --CHR.sub.6 --CHR.sub.7 --CH(OH)-- or --CHR.sub.8 --CHR.sub.9 --CHR.sub.10 --CH(OH)--, R.sub.6, R.sub.7, R.sub.8 and R.sub.10 are each, independently of one another, --H, --OH, C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 alkoxy, and R.sub.9 is --H, --OH, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or --CO.sub.Type: GrantFiled: September 15, 1997Date of Patent: November 2, 1999Assignee: Ciba Specialty Chemicals CorporationInventors: Dieter Lohmann, Donald Richard Randell
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Patent number: 5708152Abstract: Chitosan derivatives having structural units of formula I, II and III in random distribution ##STR1## wherein the substituents R.sub.1 are each, independently of one another, H or --Z--R.sub.2 --X, R.sub.3 is H or acetyl, Y is the anion O--Z--R.sub.2 --X, and(a) Z is --CO-- or --SO.sub.2 --, X is --CO.sub.2 H, --CH.sub.2 CO.sub.2 H or --CH.sub.2 PO(OH).sub.2, and R.sub.2 is --CHR.sub.4 CR.sub.5 (OH)--, R.sub.4 is --H, --OH, C.sub.1 -C.sub.4 alkoxy or C.sub.1 -C.sub.4 alkyl, and R.sub.5 is H or C.sub.1 -C.sub.4 alkyl, or(b) Z is --CO--, X is --CO.sub.2 H, and R.sub.2 is --CHR.sub.6 --CHR.sub.7 --CH(OH)-- or--CHR.sub.8 --CHR.sub.9 --CHR.sub.10 --CH(OH)--, R.sub.6, R.sub.7, R.sub.8 and R.sub.10 are each, independently of one another, --H, --OH, C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 alkoxy, and R.sub.9 is --H, --OH, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or --CO.sub.Type: GrantFiled: May 26, 1995Date of Patent: January 13, 1998Assignee: Ciba Specialty Chemicals CorporationInventors: Dieter Lohmann, Donald Richard Randell
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Patent number: 4096209Abstract: Phosphorylated alkylated phenol/phenol ester mixtures in which the weight ratio of the alkyl moiety to the phenol moiety ranges from 0.05 to about 0.65, and the number of carbon atoms per alkyl moiety ranges from 3 to 16, preferably from 3 to 12, which mixtures have satisfactory viscosity range and impart to polymeric materials and especially to polyvinylchloride plasticized therewith good light and heat stability: a process for producing such phosphorylated alkylated phenol/phenol ester mixtures; and polymeric materials plasticized therewith.Type: GrantFiled: May 31, 1977Date of Patent: June 20, 1978Assignee: Ciba-Geigy AGInventors: Donald Richard Randell, Wilfred Pickles
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Patent number: 4093680Abstract: Phosphorylated alkylated phenol/phenol ester mixtures in which the weight ratio of the alkyl moiety to the phenol moiety ranges from 0.05 to about 0.63, and the number of carbon atoms per alkyl moiety ranges from 3 to 16, preferably from 3 to 12, which mixtures have satisfactory viscosity range and impart to polymeric materials and especially to polyvinylchloride plasticized therewith good light and heat stability: a process for producing such phosphorylated alkylated phenol/phenol ester mixtures; and polymeric materials plasticized therewith.Type: GrantFiled: June 16, 1976Date of Patent: June 6, 1978Assignee: Ciba-Geigy AGInventors: Donald Richard Randell, Wilfred Pickles
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Patent number: 4069189Abstract: Phosphorylated alkylated phenol/phenol ester mixtures in which the weight ratio of the alkyl moiety to the phenol moiety ranges from 0.05 to 0.65, and the number of carbon atoms per alkyl moiety ranges from 3 to 16, preferably from 3 to 12, which mixtures have satisfactory viscosity range and impart to polymeric materials and especially to polyvinylchloride plasticized therewith good light and heat stability; a process for producing such phosphorylated alkylated phenol/phenol ester mixtures; and polymeric materials plasticized therewith.Type: GrantFiled: March 26, 1976Date of Patent: January 17, 1978Assignee: Ciba-Geigy AGInventors: Donald Richard Randell, Wilfred Pickles
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Patent number: 4049647Abstract: New 1- and 4-substituted piperidines are stabilizers for organic material. They are produced by reacting corresponding 1-substituted piperidinols with acid chlorides or corresponding 4-substituted piperidines with a compound introducing into the 1-positon a residue.Type: GrantFiled: May 14, 1975Date of Patent: September 20, 1977Assignee: Ciba-Geigy CorporationInventors: Brian Holt, Donald Richard Randell
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Patent number: 4046737Abstract: New 1- and 4-substituted piperidines are stabilizers for organic material. They are produced by reacting corresponding 1-substituted piperidinols with acid chlorides or corresponding 4-substituted piperidines with a compound introducing into the 1-position a residue.Type: GrantFiled: May 14, 1975Date of Patent: September 6, 1977Assignee: Ciba-Geigy CorporationInventors: Brian Holt, Donald Richard Randell
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Patent number: 4038280Abstract: New 4-(4'-hydroxyaryl)-2,2,6,6-tetramethyl-piperidines are used as stabilisers for organic materials, especially for polymers.Type: GrantFiled: November 28, 1972Date of Patent: July 26, 1977Assignee: Ciba-Geigy CorporationInventors: Donald Richard Randell, Malcolm John Smith
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Patent number: 4033928Abstract: Epoxy resins stabilized by at least one sterically hindered cyclic amine of the formula I ##STR1## AND SALTS THEREOF IN WHICH Q IS 1 OR 2, X represents an organic grouping which complements the nitrogen-containing ring to give a 5-membered, 6-membered or 7-membered ring, R.sub.1 and R.sub.2 represent methyl or together represent --(CH.sub.2).sub.5 --, R.sub.3 represents methyl, R.sub.4 represents alkyl with 1-5 carbon atoms or together with R.sub.3 represents the radicals --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.5 --, --CH.sub.2 --C(CH.sub.3).sub.2 --NH--C(CH.sub.3).sub.2 --CH.sub.2 -- or --CH.sub.2 --C(CH.sub.3).sub.2 --N(O.sup..)--C(CH.sub.3).sub.2 --CH.sub.2 -- and, if q is 1, Y denotes hydrogen, --O.sup.., hydroxyl, alkyl, substituted alkyl, alkenyl, alkynyl, aralkyl, substituted aralkyl or acyl or, if q is 2, Y denotes alkylene, alkenylene, alkynylene, cycloalkylene or aralkylene.Type: GrantFiled: April 1, 1975Date of Patent: July 5, 1977Assignee: Ciba-Geigy CorporationInventors: Donald Richard Randell, Barry Cook, Alexander Michael Chalmers
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Patent number: 4021432Abstract: New 1- and 4-substituted piperidines are stabilizers for organic material. They are produced by reacting corresponding 1-substituted piperidinols with acid chlorides or corresponding 4-substituted piperidines with a compound introducing into the 1-position a residue.Type: GrantFiled: May 14, 1975Date of Patent: May 3, 1977Assignee: Ciba-Geigy CorporationInventors: Brian Holt, Donald Richard Randell
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Patent number: 4014887Abstract: Disclosed are stabilized compositions comprising a polymer, especially polyolefines, and a minor proportion of a 1,2,2,6,6-pentasubstituted piperidin-4-ol. The new compositions possess good light stability.Type: GrantFiled: October 19, 1973Date of Patent: March 29, 1977Assignee: Ciba-Geigy CorporationInventors: Donald Richard Randell, Brian Holt, Alan Geoffrey Virgin
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Patent number: 3994923Abstract: Novel 4-(3,5-dialkyl-4-hydroxyphenyl)-1,2-dithiole-3-thiones are used as additives for organic materials. They are prepared by reacting a corresponding alkylated phenol with sulfur and if necessary reacting the resulting compound with sodium disulphide and then with a corresponding halide.Type: GrantFiled: June 18, 1974Date of Patent: November 30, 1976Assignee: Ciba-Geigy CorporationInventors: John Grey Dingwall, Peter Miles, Donald Richard Randell
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Patent number: 3992390Abstract: New alkyl substituted p-hydroxy aryl esters and alkyl substituted p-hydroxy aralkyl esters of 2,2,6,6-tetrasubstituted piperidin-4-ols are used as stabilizers for organic materials, especially for polymers.Type: GrantFiled: June 3, 1974Date of Patent: November 16, 1976Inventors: Brian Holt, Donald Richard Randell
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Patent number: 3968123Abstract: Novel (3-thioxo-1,2-dithiol-4-yl)substituted triaylphosphates and thiophosphates are used as additives for lubricating oils. The are prepared by reacting corresponding phosphoryl chlorides with 4-(hydroxy-aryl)-1,2-dithiole-3-thiones.Type: GrantFiled: June 17, 1974Date of Patent: July 6, 1976Assignee: Ciba-Geigy CorporationInventors: John Grey Dingwall, Donald Richard Randell
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Patent number: 3954779Abstract: A compound having the formula:- ##SPC1##And salts thereof, wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different and each is hydrogen, an alkyl residue having from 1 to 9 carbon atoms, a cycloalkyl residue having from 5 to 14 carbon atoms or a cycloalkyl-alkyl residue having from 7 to 14 carbon atoms, Y is hydrogen, 0.degree., an alkyl residue having from 1 to 4 carbon atoms, or an aralkyl residue having from 7 to 12 carbon atoms and Z is hydrogen, an unsubstituted or substituted alkyl residue having from 1 to 20 carbon atoms, an alkenyl or alkynyl residue having from 2 to 20 carbon atoms, a cycloalkyl residue having from 5 to 12 carbon atoms, an aralkyl residue having from 7 to 12 carbon atoms, an aryl residue having from 6 to 12 carbon atoms, or the group having the formula: wherein Z.sub.1 has the same significance as Z as hereinbefore defined, or Z.sub.1 is a group --NR.sub.5 R.sub.6 wherein R.sub.5 is hydrogen or an alkyl residue having from 1 to 4 carbon atoms and R.sub.Type: GrantFiled: April 1, 1974Date of Patent: May 4, 1976Assignee: Ciba-Geigy CorporationInventors: Malcolm John Smith, Donald Richard Randell
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Patent number: 3939170Abstract: Compounds having the formula ##SPC1##Where X is S, SO or SO.sub.2 and Y and Y.sup.1 are the same or different and each is H, OH, O.sup.. or a straight- or branched alkyl residue having from 1 to 4 carbon atoms, and salts thereof when Y and Y.sup.1 are other than O.sup.. are useful as stabilisers for organic materials such as diene rubbers.Type: GrantFiled: June 3, 1974Date of Patent: February 17, 1976Assignee: Ciba-Geigy CorporationInventors: Donald Richard Randell, Malcolm John Smith