A
Adrian Tuddenham
Guest
Grant Taylor <gtaylor@tnetconsulting.net> wrote:
Black patented negative feedback several years after Voigt built
amplifiers using it - and Voigt's push-pull amplifiers were re-invented
and patented by Western Electric.
Western Electric also planned to patent their 45/45 stereo system in the
1950s until it was pointed out to them that Blumlein had already
patented it 20 years earlier.
--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk
On 4/22/20 9:18 AM, Phil Hobbs wrote:
The idea of using something like that to run blinkenlights was novel
enough to patent 20 years later, but it isn't like it sprang forth
from Zeus's brow.
The claw hammer was patented (in the USA) in the early 1900s, yet it was
invented 50+ years prior.
When something is patented is not a good judge of how novel it is / was.
Black patented negative feedback several years after Voigt built
amplifiers using it - and Voigt's push-pull amplifiers were re-invented
and patented by Western Electric.
Western Electric also planned to patent their 45/45 stereo system in the
1950s until it was pointed out to them that Blumlein had already
patented it 20 years earlier.
--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk