Patents Assigned to Patent Development, Ltd.
  • Patent number: 4193814
    Abstract: A method of making a thermosetting binder for lignocellulosic materials, utilizing spent sulfite liquor, and a method of making a particleboard product. Spent sulfite liquor treated with sufficient sulfuric acid to provide a lignosulfonic acid content of not less than 0.8 milliequivalent weight of NaOH per gram of spent sulfite liquor solids, makes it possible to make particleboard with press time and physical properties comparable to phenol or urea formaldehyde bonded boards but at considerably reduced material cost.
    Type: Grant
    Filed: April 21, 1978
    Date of Patent: March 18, 1980
    Assignee: Canadian Patents & Development Ltd.
    Inventor: Kuo-Cheng Shen
  • Patent number: 4062782
    Abstract: The present invention relates to the production of a novel membrane having a larger number of small sized pores therein such that the product rate in a reverse osmosis separation using said membrane is substantially increased for a particular separation factor. The invention is predicated upon the concept that the performance of a membrane in reverse osmosis separation is primarily dependent upon two interrelated factors, namely the structure of the polymer solution from which the film is cast and the evaporation rate during the period of evaporation of the organic solvent from the cast film. The present invention thus provides processes in which the solvent structure of the solution and the evaporation rate of the solution from the cast film is adjusted towards an optimum for producing a large number of small pores in the surface layer of the membrane to increase substantially the product rate at a given separation factor.
    Type: Grant
    Filed: December 3, 1975
    Date of Patent: December 13, 1977
    Assignee: Canadian Patents and Development Ltd
    Inventors: Branko Kunst, Srinivasa Sourirajan
  • Patent number: 4007286
    Abstract: Dehydrated potato granules are prepared by cooking, mashing, freezing, predrying, granulating and finally drying the resulting product to about 7% moisture.
    Type: Grant
    Filed: June 3, 1974
    Date of Patent: February 8, 1977
    Assignee: Canadian Patents and Development Ltd.
    Inventor: Buncha Ooraikul
  • Patent number: 3944866
    Abstract: A thermionic emitter for apparatus such as electron microscopes, scanning electron microscopes, and high power vacuum tubes which require a source of electrons formed from lanthanum strontium vanadate which is prepared from the compounds La.sub.(1.sub.-x) Sr.sub.(x) VO.sub.3, where x is the fraction of strontium (Sr) incorporated into LaVO.sub.3. The value of x lies between 0.1 and 0.4.
    Type: Grant
    Filed: April 8, 1974
    Date of Patent: March 16, 1976
    Assignee: Canadian Patents & Development Ltd.
    Inventor: Michael Sayer