Axil Axil <janap...@gmail.com> wrote: Could it be,,,these inventers make obsure key components of their invention > to slow down the competision. Tesla was making bulbs too. >
No, I do not think that Edison left any critical aspects of the invention out of the patent. In those days people went from factory to another easily, taking industrial secrets with them. Edison knew that his production techniques would soon be common knowledge. Indeed, many competitors soon sprang up, and his lawyers were kept busy suing for copyright infringement. The patent has a great deal of detailed information about how to make the bulbs. If the method of achieving a high vacuum had been invented by them, or if they considered it patent-able, I expect they would have included it along with all the other details about tar and platina. - Jed
