Colgate Palmolive 1973: https://patents.google.com/patent/US3931398A/en

Merck & Co 1979: https://patents.google.com/patent/US4287173A/en

Lion Corp 1983: https://patents.google.com/patent/US4693888A/en

In all likelihood these just didn't work, but the commercial interest to not have caries immunization is just too juicy not to theorize!

Interesting, all of the ones you cite are older than 20 years, so the patents should have long expired and should be free for anyone to bring to market?