Could it be,,,these inventers make obsure key components of their invention to slow down the competision. Tesla was making bulbs too.
On Mon, Jun 22, 2015 at 9:33 PM, Jed Rothwell <jedrothw...@gmail.com> wrote: > Ahem. The patent does not actually talk about tuna. Here is a somewhat > better copy: > > > https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US223898.pdf > > The patent begins: > > "The object of this invention is to produce electric lamps giving light by > incandescence, which lamps shall have high resistance, so as to allow the > practical subdivision of the electric light." > > The next claim is about the carbon wire (filament) which offers great > resistance. > > Then it does go on to talk about putting the "burner of great resistance > in a nearly perfect vacuum, to prevent oxidation . . ." > > It says the vacuum has to be one-millionth of an atmosphere, and it says > he uses a mercury pump, but I do not see anywhere in the patent that he > claims a new method of evacuation. I do not see that he tried to patent his > method of evacuation, and Edison was careful to patent every new aspect of > his inventions. Perhaps I overlooked something. It is hard to read. > > - Jed > >
