Patents by Inventor David P. J. Pearson

David P. J. Pearson 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).

  • Herbicidal pyrazolyloxy and pyrazolylamino-benzotriazoles
    Patent number: 5190574
    Abstract: A herbicidal compound of formula (I): ##STR1## in which the dotted line indicates the presence of two double bonds arranged so as to form a fused hetero-aromatic ring system;Py is an optionally substituted pyrazole ring;W is O or NR.sup.1 ; where R.sup.1 is hydrogen or lower alkyl;X is (CH.sub.2).sub.n, CH.dbd.CH, CH(OR.sup.5)CH.sub.2, COCH.sub.2 ;where n is 0, 1 or 2;R.sup.2 and R.sup.3 are independently selected from H, optionally substituted alkyl, alkenyl or alkynyl, halogen, NR.sup.6 R.sup.7, or R.sup.2 and R.sup.3 together with the carbon to which they are attached form an optionally substituted alkenyl or cycloalkyl group;R.sup.4 is CO.sub.2 R.sup.8, CN, COR.sup.8, CH.sub.2 OR.sup.8, CH(OH)R.sup.8, CH(OR.sup.8)R.sup.9, CSNH.sub.2, COSR.sup.8, CSOR.sup.8, CONHSO.sub.2 R.sup.8, CONR.sup.10 R.sup.11, CONHNR.sup.10 R.sup.11, CONHN.sup.+ R.sup.10 R.sup.11 R.sup.12 R.sup.14-, CO.sub.2.sup.- R.sup.15+ or COON.dbd.CR.sup.10 R.sup.11 ;R.sup.15+ is an agriculturally acceptable cation and R.sup.
    Type: Grant
    Filed: February 7, 1991
    Date of Patent: March 2, 1993
    Assignee: Imperial Chemical Industries plc
    Inventors: David P. J. Pearson, John E. D. Barton, Christopher J. Mathews, David Cartwright, Susan P. Barnett
  • Certain herbicidal 1,2,4-triazolo[4,5-b]pyridines
    Patent number: 5133798
    Abstract: A compound of formula (I): ##STR1## in which the dotted lines indicate the presence of two double bonds arranged so as to form a fused hetero-aromatic ring system;Ar is an optionally substituted aryl or heterocyclic ring;W is O or NR.sup.1, where R.sup.1 is hydrogen or lower alkyl;X is (CH.sub.2).sub.n, CH.dbd.CH, CH(OR.sup.5)CH.sub.2, COCH.sub.2 ;where n is O, 1 or 2;R.sup.2 and R.sup.3 are independently selected from H, optionally substituted alkyl, alkenyl or alkynyl, halogen, NR.sup.6 R.sup.7 or R.sup.2 and R.sup.3 together with the carbon to which they are attached form an optionally substituted alkenyl or cycloalkyl group;R.sup.4 is CO.sub.2 R.sup.8, CN, COR.sup.8, CH.sub.2 OR.sup.8, CH(OH)R.sup.8, CH(OR.sup.8)R.sup.9, CSNH.sub.2, COSR.sup.8, CSOR.sup.8, CONHSO.sub.2 R.sup.8, CONR.sup.10 R.sup.11, CONHNR.sup.10 R.sup.11, CONHN.sup.+ R.sup.10 R.sup.11 R.sup.12 R.sup.13-, CO.sub.2.sup.- R.sup.14+ or COON.dbd.CR.sup.10 R.sup.11 ;R.sup.14+ is an agriculturally acceptable cation; and R.sup.
    Type: Grant
    Filed: February 7, 1991
    Date of Patent: July 28, 1992
    Assignee: Imperial Chemical Industries PLC
    Inventors: David P. J. Pearson, John E. D. Barton, David Cartwright, Susan P. Barnett
  • Method for inducing tillering utilizing certain pyridine-1-oxides
    Patent number: 4473395
    Abstract: This invention relates to a method of inducing tillering in cereal plants using certain 5-phenyl-3-pyridinecarboxylate compounds, to certain of the compounds themselves, to a process for preparing these compounds, and to agricultural compositions containing them. The compounds are also useful as intermediates for preparing other of the compounds.
    Type: Grant
    Filed: May 17, 1982
    Date of Patent: September 25, 1984
    Assignee: Imperial Chemical Industries PLC
    Inventors: Alan F. Hawkins, David P. J. Pearson, Gilbert J. Stacey