Patents by Inventor Harold C. Lange

Harold C. Lange 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).

  • Derivatives of N-hals-substituted amic acid hydrazides
    Patent number: 5397821
    Abstract: N-(2,2,6,6-tetraalkyl-4-piperidinyl)amic acid hydrazides contain a light stabilizing group, a heat stabilizing group and an amic acid hydrazide functionality in the same molecule. The amic acid hydrazide functionality in the compounds enhances the photooxidative stabilizing properties of the hindered amine groups and contributes thermal and oxidative stabilizing and metal complexing properties to the compounds. The novel compounds are excellent light stabilizers for polyolefins, have low volatility and are not readily lost from polymeric systems via volatilization, migration or extraction.
    Type: Grant
    Filed: April 28, 1994
    Date of Patent: March 14, 1995
    Assignee: Elfatochem North America, Inc.
    Inventors: Ronald E. MacLeay, Harold C. Lange
  • Derivatives of N-HALS-substituted amic acid hydrazides
    Patent number: 5338853
    Abstract: N-(2,2,6,6-tetraalkyl-4-piperidinyl)amic acid hydrazides contain a light stabilizing group, a heat stabilizing group and an amic acid hydrazide functionality in the same molecule. The amic acid hydrazide functionality in the compounds enhances the photooxidative stabilizing properties of the hindered amine groups and contributes thermal and oxidative stabilizing and metal complexing properties to the compounds. The novel compounds are excellent light stabilizers for polyolefins, have low volatility and are not readily lost from polymeric systems via volatilization, migration or extraction.
    Type: Grant
    Filed: November 18, 1991
    Date of Patent: August 16, 1994
    Assignee: Elf Atochem North America, Inc.
    Inventors: Ronald E. MacLeay, Harold C. Lange