Glass balloons and method for making same
OwnerDavid Rogers Crosbyinventor
Life of this patent
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Abstract
A glass balloon that floats in air. An assembly of glass balloons that form a slab of foam that floats in air. A process for making glass balloons employing: two nested furnaces, pre-heated helium, a moving furnace, and a refrigerated seal-off chamber.
Claims9
An approximately spherical envelope of glass, containing a lighter-than-air gas, the combined weight of the glass and of the contained gas being less than the weight of the displaced air;
- a gas-tight seal integral with the envelope, the mass of the gas within the envelope so choosen that the principal stress in the envelope is tension due to the internal gas pressure said pressure having a slightly positive pressure in relation to ambient.
The process of constructing a glass envelope containing a lighter-than-air gas, the combined weight of the glass and of the contained gas being less than the weight of the displaced air, and employing a mold-free glass blowing sequence in which a lighter-than-air gas is used to expand a hot gas bud and the injection of the gas is regulated said that the volume of the gas is measured to inject approximately 1/3 of the ultimate gas into the envelope, lowering the temperature of the envelope and while lowering the temperature, injecting additional gas into the envelope to maintain a substantially constant pressure, said pressure being slightly above atmospheric.
Dependencies are inferred from the claim text.