1. (canceled)
2. (canceled)
3. (canceled)
4. (canceled)
5. (canceled)
6. (canceled)
7. Silica gel made by contacting a synthetic platy magadiite with an acid in an aqueous liquid wherein more than fifty percent by weight of the synthetic magadiite is platy magadiite in the form of individual plates.
8. Silica gel made by contacting a synthetic platy magadiite with colloidal silica and an acid in an aqueous liquid wherein more than fifty percent by weight of the synthetic magadiite is platy magadiite in the form of individual plates.
9. (canceled)
10. (canceled)
11. (canceled)
12. (canceled)
13. (canceled)
14. A method for the production of platy sodium octasilicate, comprising the step of: heating a liquid aqueous colloidal silica dispersion containing silica, sodium oxide, and water, the mole ratio of the silica to the sodium oxide being in the range of from about 3.5 to about 10.
15. The method of claim 14, wherein the temperature is in the range of from about 80 to about 125 degrees Celsius and the mole ratio of the silica to the sodium oxide is in the range of from about 4 to about 6.
16. The method of claim 14, wherein the temperature is in the range of from about 95 to about 115 degrees Celsius and the mole ratio of the silica to the sodium oxide is in the range of from about 4.3 to about 5.2.
17. The method of claim 14, wherein the temperature is in the range of from about 100 to about 110 degrees Celsius and the mole ratio of the silica to the sodium oxide is in the range of from about 4.5 to about 4.7.
18. A method for preparing a liquid aqueous colloidal silica dispersion, the dispersion having a mole ratio of silica to sodium oxide of from 3.5 to 10, comprising the step of: mixing a sufficient amount of liquid aqueous colloidal silica suspension with a liquid aqueous sodium silicate suspension to produce the liquid aqueous colloidal silica dispersion, the liquid aqueous colloidal silica suspension having a mole ratio of silica to sodium oxide of more than 20, the liquid aqueous sodium silicate suspension having a mole ratio of silica to sodium oxide of less than 3.5, the rate of mixing being effective to prevent the gellation or solidification of the liquid aqueous colloidial silica dispersion.
19. The method of claim 18, wherein the liquid aqueous colloidal silica dispersion has a mole ratio of silica to sodium oxide of from 4 to 10.
20. The method of claim 18, wherein the liquid aqueous colloidal silica dispersion has a mole ratio of silica to sodium oxide of from 4 to 6.
21. The method of claim 18, wherein the liquid aqueous colloidal silica dispersion has a mole ratio of silica to sodium oxide of from 4.5 to 5.2.
22. The method of claim 18, wherein the liquid aqueous colloidal silica dispersion has a mole ratio of silica to sodium oxide of from 4.5 to 4.7.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. Apparatus for use in a gas grill, having a burner with a central opening and a pilot, for shutting off the flow of gas extinguishing the flame when a cooking utensil is removed from the burner and for opening the flow of gas for automatic ignition by the pilot when the cooking utensil is placed on the burner comprising:
a mechanically operated valve having gas inlet and gas outlet ports, and being positioned on the grill remote from the burner;
a valve actuator arm having a pivot closely adjacent one end in spaced relation to the valve and extending laterally beneath the burner and being spring biased upwardly toward the burner on the other end; and
an actuator member supported by the other end of the valve actuator arm above the burner for receiving the cooking utensil when placed on the burner;
whereby the actuator arm is pivotally supported adjacent the one end and is spring biased upwardly providing an elongated lever member between the cooking utensil and the valve being of greater length than a portion of the actuator arm in laterally spaced relation to the valve adjacent the one end.
2. The apparatus set forth in claim 1 wherein the actuator member has an upright component integral therewith extending upwardly through the burner.
3. The apparatus set forth in claim 2 wherein the upright component has an offset end for clearing grill support members and for providing central support for the cooking utensil.
4. The apparatus set forth in claim 2 wherein the valve is located in closely spaced relation to the pivot and remote from said other end.
5. The apparatus set forth in claim 2 wherein the valve actuator arm is spring biased upwardly by a coil torsion spring located upon the pivot.
6. The apparatus set forth in claim 5 wherein the upward motion of the valve actuator arm is limited and at its uppermost location positions the actuator ring in an inclined position to receive a cooking utensil.
7. A method for use of a gas grill, having a burner with a central opening and a pilot comprising the steps of:
providing a mechanically operated valve having gas inlet and gas outlet ports, and being positioned on the grill remote from the burner;
pivotally mounting a valve actuator arm adjacent one end in laterally spaced relation to the valve;
opening the flow of gas for automatic ignition by the pilot when the cooking utensil is placed on the burner; and
shutting off the flow of gas extinguishing the flame when a cooking utensil is removed from the burner; and
positioning an actuator member on the valve actuator arm above the burner for receiving the cooking utensil when placed on the burner.