Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 4229228 | Coating composition A coating composition which results from hydrolyzing 35 to 70 weight percent tetraethyl orthosilicate and 60 to 20 weight percent of certain silane is useful for providing abrasion resisting coatings for plastics after curing. Optionally, up to 20 weight ... | 10/21/1980 |
| 4227950 | Direct casting method for producing low-stress glass/plastic composite lenses A glass-plastic composite lens combining a glass element with a high-shrinkage thermosetting plastic is provided in accordance with a direct casting process comprising a consolidation heating step, subsequent to plastic curing and shrinkage, during which ... | 10/14/1980 |
| 4225698 | Optical components consisting of aromatic polyesters molded in the form of an optical lens Thermoplastic aromatic polyesters comprising cocondensed bisphenol residues generally have a refractive index nd of from 1.60 to 1.66, an Abbe coefficient vd of from 27 to 21 and a color triplet of about 5.1, 0.1, O and are excellent... | 09/30/1980 |
| 4189207 | Deep focus fiber optic lens A lens comprising a plurality of identical straight optical fibers arranged in a bundle with at least a portion of each fiber treated to suppress internal reflections, so that each fiber transmits only rays which enter the end of the fiber substantially p... | 02/19/1980 |
| 4029395 | Method for altering the focal zone of a lens system A method for altering the lateral dimension of the focal zone produced by an integral ultrasonic lens system. The method comprises the steps of removing a volume of lens material from the integral lens system so as to define two separate and distinct rema... | 06/14/1977 |
