When Was the First CMOS Version of the 555 Timer Introduced and by Which Company?

Thank you David, and Jacob. Yes I found the Wikipedia article. I also stumbled upon the article in EE Times. However there's nothing specific about the (first) CMOS version of the 555, nor do I find this (yet) elsewhere. It may be 1971/1972, the same as the bipolar version, but is it? Here's Wikipedia:
Introduced in 1972[3] by Signetics,[4] the 555 is still in widespread use due to its low price, ease of use, and stability. It is now made by many companies in the original bipolar and in low-power CMOS technologies.
I'm sorry to post my reply as a new question.  The server denies access to a reply: ref. #18.879b25c4.1535359858.2cfcee2

Thomas, apologies, I did not see through the CMOS part of your question.  From recollection the CMOS version did not surface till a good few years after the initial version (like 5 years or more) but I can find nothing to back this up.  I found several articles on the history of the 555 but none had any specifics on this.  If I find out more I will get back to you here.

ThomasFrom my recollection (on my perch in  out of the mainstream South Africa), the first CMOS part was the ICM7555 from Intersil. The earliest data book I have is from 1986 and it does appear in that, but unfortunately there is no other dating information in the data sheet. SO all I can give you definitively that it was before 1986.As I organise my memories about Intersil parts that I was using, my guess it would have been about 1978, about the same time they introduced the first CMOS EPROM.

I've got it.  I looked for news stories.  ETI announced the first 555 CMOS timers, the ICM7555 and ICM7556, from Intersil Cupertino in August 1978.

Have a look at this article, not only the date, but a good run down on the CMOS processCMOS 555

Cheers,Richard