Assertion: gypsum | /r/HasProperty | guilty of misuse of the patents
Facets:
value: since 1948
type: TEMPORAL
Source sentences:
text: In terms of this case, this means that Gypsum may not recover from these appellees for their use of its patents between February 1, 1948, and May 15, 1951, if Gypsum has been guilty of misuse of the patents since 1948 or if the original misuse found in the antitrust litigation remained unpurged.