The Cyclic Anhydride Is Five-membered (e.g., Succinic Anhydride, Etc.) Patents (Class 549/233)
- Tetracyclo ring system having the cyclic anhydride as one of the cyclos (Class 549/235)
- Tricyclo ring system having the cyclic anhydride as one of the cyclos (Class 549/236)
- Bicyclo ring system having the cyclic anhydride as one of the cyclos (Class 549/240)
- Plural bicyclo ring systems each having the cyclic anhydride as one of the cyclos (Class 549/241)
- Nitrogen or additional chalcogen bonded directly to the bicyclo ring system (Class 549/243)
- Having -C(=X)-, wherein X is chalcogen, bonded directly to the bicyclo ring system (Class 549/244)
- Halogen bonded directly to the bicyclo ring system (Class 549/246)
- Phthalic anhydride per se (Class 549/247)