Yesterday I was told that JBL had patent on edgewound voicecoils. I have googled it today without success. Anobody here knows?
Is there a list of all JBL patents?
Mårten
Yesterday I was told that JBL had patent on edgewound voicecoils. I have googled it today without success. Anobody here knows?
Is there a list of all JBL patents?
Mårten
I'm sure that patent has long since lapsed.
There were edge wound voice coils before JBL ever existed
They may have held some specific patent on some specific manufacturing technique or type of edge wound voice coils, but they did not invent the design
I would think that would preclude them from ever holding a blanket design patent for a design type they did not create (invent)
If you REALLY need or want to know, here you go:
http://patft.uspto.gov/
Thanks Wagner
If you REALLY need or want to know, here you go:
http://patft.uspto.gov/JBL Patents after 1975:Patents from 1790 through 1975 are searchable only by Issue Date, Patent Number, and Current US Classification.
http://patft.uspto.gov/netacgi/nph-P...FIELD2=&d=PALL
Lansing-related Patent Parade
Very interesting thread! Google has indexed all US patents. The thread has all Lansing patents listed.
Telefunken had the original patent: http://www.google.com/patents/US1935...dspeaker+wound
There is a lot more going on with that old Telefunken patent than just the wire profile or cross section..................edge wound voice coils (voice coils using square or rectangular "shaped" wire) existed at least as far back as the '20s and maybe even before
Who did it first versus who applied for and received a patent for it (or if they even did, based solely on the wire shape) I couldn't tell you and I doubt you'd ever be able to really know with certainty...................a great deal of experimentation was going on all over the World during the early days of radio
That being said, I wouldn't bet against it being Telefunken
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