Quote:

The story goes that Mr Robertson licenced the manufacture of his invention to a French firm who tried to drive him out of business. He regained ownership of the devise but then got gun shy of others so refused to licence it again to his folly. Too bad, it beats the heck out of most other drive patterns for general usage. http://www.mysteriesofcanada.com/Ontario/robertson_screws.htm



Reminds me of Robert Kearns and his intermittent wipers. Coming up with a great idea is only half the battle. You then have to find someone to market it and possibly defend your property in court. I can see why Mr. Robertson became a little gun shy.