Assertion: phosphoric acid | /r/HasProperty | taught as operable option
Facets:
value: in u.s. patent 4,289,812
type: LOCATION
Source sentences:
text: At this point, the use of an anhydrous form, 100% or higher, of phosphoric acid, which is taught as an operable option in U.S. Patent 4,289,812 was considered, as this would permit the phosphorylation step to be carried out in the absence of water.