Now showing items 1-2 of 2
Method of producing star-like polymers from lignin
(United States Patent and Trademark Office, 1991-11-19)
A method of producing prepolymeric materials from lignin is disclosed. The method uses lignin which has been hydroxyalkyl modified, such that the lignin is substantially non-phenolic and solvent soluble and/or liquid. The ...
Ophthalmic contact lens with internal fixation light for examination of the optic nerve
(United States Patent and Trademark Office, 1991-06-18)
An instrument and method for examining the optic nerve head (34) of a patient's eye (14) is disclosed. The instrument is comprised of a gonioscopic lens (10) a lens system (26) where the lens system (26) directs a collimated ...