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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 |
| 4999066 | Process for bonding tiles to substrate using magnesium phosphate comprising activator prepared by mixing inert porous material with liquid P2 O5 material A fast-setting magnesium phosphate one-component adhesive/grout is used to bond tiles, e.g. ceramic tiles, to a substrate, e.g. sheet-rock. The grout comprises an activator prepared by e.g., mixing diatomaceous earth with at least a sufficient amount of a... | 03/12/1991 |
| 4874593 | Conversion of pyrophoric P4 -containing material to P2 O5 material A process for treating a pyrophoric P4 -containing material to convert it to a substantially non-pyrophoric P2 O5 material is described. The process comprises supplying streams of fluid P4 -containing material a... | 10/17/1989 |
| 4828823 | Dicalcium phosphate dihydrate for fluoride dentifrice compositions The monofluorophosphate compatibility of dicalcium phosphate dihydrate can be improved in processes in which a slaked lime slurry is reacted with phosphoric acid to form a monocalcium phosphate solution to which is added magnesium oxide, additional lime s... | 05/09/1989 |
| 4824649 | High viscosity potassium metaphosphate An improved process for preparing potassium metaphosphate is provided which comprises reacting potassium ions, preferably from the carbonate or bicarbonate, with phosphare ions in an amount sufficient to provide a K/P molar ratio ranging from about 0.85 t... | 04/25/1989 |
| 4820325 | Treatment of toxicant-impregnated filter cake A filter cake formed of a glass precursor material and impregnated with a normally leachable toxicant can be heated, preferably with at least one other glass precursor material, at a sufficiently high temperature to form a molten composition which solidif... | 04/11/1989 |
| 4814151 | Soda ash manufacture An improved process for the manufacture of soda ash from trona by the sodium carbonate monohydrate method utilizing an activated carbon treatment of evaporator fines bleed.... | 03/21/1989 |
