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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 4386956 | Metal recovery process from aluminum dross An improved method for recovery of metal, particularly aluminum, from metal bearing dross utilizes a trough for collection of the dross. A wedge member compresses the dross in the trough. In this manner, metal is decanted from the compressed dross and flo... | 06/07/1983 |
| 4345724 | Lightweight reel A lightweight, readily assembled and disassembled reel for transporting and dispensing material such as flexible tubing or electrical conduct or is disclosed. The reel comprises a pair of flanges, each flange having connected thereto a plurality of spaced... | 08/24/1982 |
| 4339720 | Telluric noise cancellation in induced polarization prospecting Apparatus and method for generating a record of telluric noise which is substantially free of induced polarization signals and is suitable for removal of noise components from induced polarization signal records. The apparatus includes a single pair of te... | 07/13/1982 |
| 4312064 | Modified vestigial side band transmission system A communication transmission system includes one or more modulated carrier communication channels in which a receiver has a modified vestigial side band filter for eliminating phase cancellation. Accurate design of the modified vestigial side band filters... | 01/19/1982 |
| 4296576 | Sloped wall structure and anchor clip A sloped wall structure is formed from a plurality of rafters arranged in spaced, parallel inclined attitude extending from a lower support surface upwardly to a higher support surface. Anchor clips are positioned at the lower end of each rafter and pivot... | 10/27/1981 |
| 4193968 | Process for recovering gallium The invention provides a process for recovering gallium from calcined clay leached with hydrochloric acid. The leach solution containing aluminum, ferric and gallium chlorides is treated by ion exchange to first remove aluminum ions, following which the s... | 03/18/1980 |
| 4178174 | Direct production of copper metal The invention disclosed is a process for the direct production of copper metal by directing an aqueous slurry of cupriferous material into a molten cupriferous bath maintained at a temperature of 2100° to 2400° F. Neither the cupriferous material of the... | 12/11/1979 |
| 4148630 | Direct production of copper metal This invention comprises a process for the direct production of copper metal from a cupriferous slurry comprising forming a molten bath of cupriferous material at a temperature of about 2100° to 2400° F., at least one of said bath and said slurry compri... | 04/10/1979 |
