Anyone sending a Bfcetchand description may quickly ascertain our opinion free whether an invention is probably patentable. Com mPunica-tiovDe8n8tric tly confidential. HANDBDO on Extneltal 8ent free. Oldest agency for 8ecurlng datents. Patents taken through Munn & Co. receive special notice, without charge, la the Sdtntific Jmtrican. A bandsomely illustrate weekly. Largest circnlatlon of any scientific journal. I"rl8, (3 a year; four months, |L Sold by all newsdealers. HBo 00 .3I l Wulo York Branch Offloa. OS W B&. Washington. D.C.
This article was originally published with the title "Patents" in Scientific American 97, 22, 403 (November 1907)