Patents by Inventor James Chervenka, Jr.

James Chervenka, Jr. 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).

  • High early strength cement
    Patent number: 3997353
    Abstract: A high early strength cement composition is disclosed which is capable of providing sufficient compressive strength within 2 to 24 hours to enable one to use it in highway or airport runway patching. The cement also exhibits satisfactory ultimate strength, that is, strength after 28 or more days of curing. The high early strength cement comprises a mixture of portland cement, calcium aluminate, and calcium sulfate in certain specified proportions.
    Type: Grant
    Filed: August 8, 1975
    Date of Patent: December 14, 1976
    Assignee: Aluminum Company of America
    Inventors: James Chervenka, Jr., Raymond P. Heilich