Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| D625833 | Performance shell | 10/19/2010 |
| 7118305 | Wave shaped vehicle barrier A vehicle barrier uses adjacent rows of wave-like sections adapted to be positioned on a ground surface. A section is defined by (i) a planar wall extending angularly upward from the ground surface to the section's peak, and (ii) a concave wall extending angularly d... | 10/10/2006 |
| 4683689 | Modular reinforced building structure and method A modular reinforced concrete building is in a generally elongated hexagonal shape, with a roof having peaks at both ends of the building and sloping downwardly toward the central portion of the building from such peaks to form a concave ridge. The buildi... | 08/04/1987 |
| 4581860 | Saddle-shaped cable dome system for large span lightweight roof structures Disclosed is a shelter structure using a saddle-shaped cable dome system for a large-span, lightweight roof membrane. The structure uses the curvatures of a saddle surface, combined with two orthogonal cable nets separated by a set of compression struts, ... | 04/15/1986 |
| 4467571 | Construction units and assemblies, and structures fabricated from such units and assemblies This invention relates to construction units and assemblies, and to structures fabricated from such units and assemblies, and is particularly concerned with stressed membrane structures, and specifically with modular, multiple membrane structures.... | 08/28/1984 |
| 4404980 | Arched support structure with cover A covered structure is formed in an arched shape and utilizes PVC pipe which is slidable through sleeves electrically welded to a cover. The PVC pipe is bent into an arched shape and is attached to spreader bars which serve as the ground contacting portio... | 09/20/1983 |
| 4155210 | Process for building up towers, particularly water towers (A) A process for building up towers consisting of a surface particularly not cylindrical which consists of elements at least corresponding to a large fraction of the height of the construction. (b) A process wherein molds corresponding to the length of the el... | 05/22/1979 |
| 3970096 | Tent The tent herein comprises outer nonporous and inner porous layers disposed in spaced relation to each other, with a continuous air passageway therebetween. Compression tent supporting means comprises a plurality of demountable, substantially, semicircular... | 07/20/1976 |
