Noticed many sellers and buyers having trouble connecting to buy/sell old Corelle dishware because of mistaken pattern names.  The Corelle Company has an online guide to identify the names of vintage and retired dish patterns that can be found from their homepage.  When trying to identify old dishware the manufacturers often are the best resource.  Most have library of their catalogs or other reference material to date when patterns were produced and their pattern name.  I've located materials through manufacturers to identify rarer Tupperware pieces, Corelle pattern names and tracked information on all sort of kitchen ware by contacting the manufacturers.  It takes some time but the effort can rewarding.  If you have to make a written request expect several months delay as research isn't the manufacturers top priority.  I've found many kitchen manufacturers to be very helpful and some even supplied copies of the original marketing ads or product information sheets that can add a nice touch for your collections.