Patents.
Re. 28,162; 3,884,553; 3,977,778; 4,025,180; 4,050,788; 4,056,307; 4,056,308; 4,062,629; 4,063,805; 4,063,806; 4,065,208; 4,066,335; 4,066,339; 4,067,646; 4,068,932; 4,070,097; 4,073,579; 4,078,169; 4,095,899; 4,078,856; 4,078,858; 4,081,672; 4,088,389; 4,092,060; 4,095,900; 4,096,387; 4,096,407; 4,097,749.