Run your finger around the lower right corner on the back and you will find "Patent pending" in raised relief. Best I can tell, these are the oldest jewel cases from 1983. I also see that these "Patent pending" cases came in two types, one with a rounded hinge and one with a square-ish hinge. I'm talking about the easily broken tabs on the front lid that connect to the case body. Here are titles I've found so far. Telarc CD 80078 Copland Appalachian Spring, Rodeo, Fanfare for the Common Man (rounded hinge) Telarc CD 80060 Beethoven Symphony No. 5 (rounded hinge) Delos D/CD 3022 Liszt Sonata in B minor Delos D/CD 3012 Mozart Symphonies 40 & 41 Delos D/CD 3007 Vivaldi Four Seasons (rounded hinge) Delos D/CD 3001 Haydn/Hummel Trumpet Concertos Delos D/CD 3003 American Brass Delos D/CD 4002 Mavis Rivers MFSL MFCD 802 Ravel Bolero MFSL MFCD 817 Schubert Symphony No. 9 PAUSA PCD 7148 Rob McConnell & the Boss Brass Vol. 1 (rounded hinge) How about you? What do you have in "Patent pending" cases? And do any of them have rounded hinges?