US 12,269,748 B2
Methods for producing and products including hollow silica or hollow glass spheres
David Charles Lynch, Kingsport, TN (US)
Filed by Plassein Technologies Ltd. LLC, Las Vegas, NV (US)
Filed on Sep. 7, 2021, as Appl. No. 17/468,138.
Claims priority of provisional application 63/074,667, filed on Sep. 4, 2020.
Prior Publication US 2022/0212939 A1, Jul. 7, 2022
Int. Cl. C01B 33/18 (2006.01); B01J 13/02 (2006.01)
CPC C01B 33/18 (2013.01) [B01J 13/02 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method for producing a hollow sphere with a vacuum inside, said method comprising:
providing a seed, said seed including a core and a coating outside said core, said core including a mixture of two or more compounds;
heating said seed to a temperature sufficient to transform said coating into a continuous shell having an interior and an exterior, said continuous shell isolating said core from said exterior of said shell, said temperature also being sufficient to cause a reaction between said two or more compounds of said core, said reaction between said two or more compounds converting said core to a gas within said shell;
controlling a rate of said heating and a pressure surrounding said exterior of said shell to allow said shell to expand responsive to a pressure of said gas within said shell;
continuing to heat said seed until said reaction ceases to produce said gas;
cooling said shell to a second temperature at which said shell becomes rigid; and
continue to cooling said shell until said gases within said shell react with one another to revert to a solid form, thereby creating a vacuum within said rigid shell.