https://patents.google.com/patent/US6372224B1/en
:US6372224B1 ( Timothy J. Miller, Sharon Klepfer, Albert Paul Reed, Elaine V. Jones. Assignee Pfizer Inc.) Year 2000 (spike protein vaccine for Canine corona virus)
Archived: https://archive.ph/CeGzj
https://patents.google.com/patent/US7220852B1/en :US7220852B1 - Coronavirus isolated from humans - filed Apr. 12 2004
Archived: https://archive.ph/Pdnkv
https://patents.google.com/patent/US6372224B1/en
:US6372224B1 ( Timothy J. Miller, Sharon Klepfer, Albert Paul Reed, Elaine V. Jones. Assignee Pfizer Inc.) Year 2000 (spike protein vaccine for Canine corona virus)
Archived: https://archive.ph/CeGzj
https://patents.google.com/patent/US7220852B1/en :US7220852B1 - Coronavirus isolated from humans - 2004
Archived: https://archive.ph/Pdnkv