Harder Patent Does Not Cover 
Concrete Silos 
For the information of parties planning the 
erection of concrete silos, we quote the following 
from the opinion of our patent counsel relative to 
the Harder patent No. 627732. 
"The Harder patent as interpreted by Judge 
, ; .UB. Ugiited to a^silo having a continuous 
•*• • ®P.^niJig;fr©rn,tbj).^ Bott«q>j a series of sliding 
doors, reirIfo!-elag-:fejfij)s^nfl^3ra€e*si)/^cWliar*; "l 
forrn. The court said in its"djJirTi©'h,* ,*It«. is**' 't 
obv\9u2 .1iJ}^*lhe;br«ces,of, the Harder patent 
would t)e Bupfejgjiou^ iij 9t9ne (5i;l>riclc.'5ilos ' ; 
this being true, the * harder ^ ma pJ-ov4ment 
would be wholly unnecessary in silos made of 
concrete. 
Therefore we advise you that the Harder 
patent does not cover all forms of silos; that 
it is limited and restricted to substantially the 
exact construction which it shows and de- 
scribes and that it is unnecessary, if not 
undesirable, in silos made of concrete." 
Since concrete silos are not covered by the 
Harder patent, farmers and contractors need have 
no hesitancy in building silos of concrete and are 
requested to advise the Universal Portland Cement 
Co. of cases where any claim of an infringement 
is made. 
