Drill screw and methods and apparatus for manufacturing same
CA 1082010 A · Owner: Nl Industries, Inc. · Inventors: Whittaker, Charles B. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
TO ALL WHOM IT MAY CONCERN:, BE IT KNOWN THAT I CHARLES BURTON WHITTAKER, JR. a, citizen of the United States of America residing at 1015-5, Foxcroft Lane, County of Iredell Statesville, North Carolina, have invented certain new and useful improvements in DRILL SCREW AND METHODS AND, APPARATUS FOR MANUFACTURING SAME ABSTRACT OF DISCLOSURE, A drill screw comprising a threaded fastener with a drill bit formed on its entering end, the drill bit characterized by a bi-arc cross-section, that is the shape which is shared by two partially overlapping circles.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted July 22, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 22, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.