JBL edgewound VC patent?

[more10]

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

[NickH]

I'm sure that patent has long since lapsed.

[Wagner]

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

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/

[more10]

Thanks Wagner

If you REALLY need or want to know, here you go:
http://patft.uspto.gov/

Patents from 1790 through 1975 are searchable only by Issue Date, Patent Number, and Current US Classification.

JBL Patents after 1975:

http://patft.uspto.gov/netacgi/nph-P...FIELD2=&d=PALL

1	D267,644		Loudspeaker magnet housing
2	D266,420		Loudspeaker magnet housing
3	4,324,312		Diaphragm suspension construction
4	4,308,932		Loudspeaker horn
5	D247,490		Loudspeaker assembly
6	4,039,243		Electrical connector

[more10]

Lansing-related Patent Parade

Very interesting thread! Google has indexed all US patents. The thread has all Lansing patents listed.

[more10]

Telefunken had the original patent: http://www.google.com/patents/US1935...dspeaker+wound

[Wagner]

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