November 13, 2015 | Posted in:Patents

The patent truth, did you know…

this about the invention of the Phillips head screw?


the patent truth about the Phillips head screw
The Phillips head screw was invented because early 20th century assembly machines had a hard time interfacing with a typical slot-had screws.

Enter Canadian born inventor P. L. Robertson who invented a self-centering cross shaped screw design. Mr. Robertson was unsuccessful in persuading industry executives of the benefits of his design. So, he sold his patent to Henry F. Phillips who refined the design, obtained fresh patents and saw his namesake screw adopted by General Motors in 1937 to build Cadilacs.

Facts from the Patent Guys – contact us for more information about patents for your business.

Arthur M. Peslak, Esq. Registered Patent Attorney
Richard Malagiere, Esq. Registered Patent Attorney

The Patent Guys are attorneys in the Intellectual Property Practice Group of the law firm of Gertner Mandel LLC providing legal support for legal, technical & business issues.