[EE] Everset Technologies

I was looking at this patent:

https://patents.google.com/patent/US8774317B2

it *appears* that it's not in force ?  Otherwise if it was it runs
until 2032 as I understand it.

Everset is the company that got the NIST to change the modulation of
WWVB, adding BPSK to give better coverage in weak signal areas.

This has never caught on, must be the cost ? - the only clock I could
find using the Everset chip is this one from Lacrosse:

https://www.ebay.com/itm/388836130899

The only place that sells the ES100 chip module is in Canada

https://www.universal-solder.ca/product/everset-es100-mod-wwvb-bpsk-phase-modulation-receiver-module/

they also sell on Ebay.

Here is a homebrew approach to a WWVB receiver using BPSK demodulation:

https://www.arrl.org/files/file/QEX_Next_Issue/2015/Nov-Dec_2015/Magliacane.pdf

I suppose one other consideration is that other areas of the world may
not have similar coverage needs for their "atomic clocks" ?

Chuck