Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 4177867 | Self-drilling dowel with an inclined rolling head A self-drilling dowel consists of a tubular-shaped member with a drilling head at one end. The drilling head is formed of a plurality of teeth each having a tip. The tip of the teeth are all disposed in a single plane inclined at an angle to the axis of t... | 12/11/1979 |
| 4168755 | Nutating drill bit A nutating earth drilling bit which is adapted for use in drilling systems in which the drilling fluid and cuttings are transported from bit to surface through the interior of the drill string. The nutating bit is provided with a toroidal cutting member a... | 09/25/1979 |
| 4128136 | Drill bit A diamond drill coring bit having an annular crown and inner and outer concentric side surfaces. The crown is formed from a number of radially extending composite segments spaced apart circumferentially by a circumferential spacer material, all integrally... | 12/05/1978 |
| 4098361 | Drilling head connection for use in a reverse circulation system The invention relates to a drilling head connection specifically designed for reverse circulation operation and the connection can be screwed on a double pipe system in such a way that the drilling fluid injected into the annular space passes through the ... | 07/04/1978 |
| 4098362 | Rotary drill bit and method for making same A rotary rock drill bit comprising a plurality of cutting elements or cutters mounted in the crown of the drill bit. Each cutting element comprises a thin planar layer of polycrystalline diamond bonded in the crown of the bit at a rake angle of between -1... | 07/04/1978 |
| 4056152 | Drill bit for reinforced concrete A rotary bit for drilling concrete and reinforced concrete having a hollow drill stem with a transversely disposed drilling face at its outer end, the face having annularly disposed sawtooth surfaces including abrupt step portions alternating with trailin... | 11/01/1977 |
| 3999619 | Core barrel A core barrel comprises an elongate hollow cylinder having a substantially uniform diameter throughout its length and having apparatus at one end thereof for connection to a kelly. The opposite end of the core barrel cylinder is provided with a plurality ... | 12/28/1976 |
| 3999620 | Core barrel A core barrel comprises an elongate hollow cylinder having a substantially uniform diameter throughout its length and having apparatus at one end thereof for connection to a kelly. The opposite end of the core barrel cylinder is provided with a plurality ... | 12/28/1976 |
| 3981371 | Core sampling drill A core sampling drill comprising a drill bit having a series of cutting surfaces arranged around a central core hole, the upper end of the drill bit being threaded so that it can be fitted to the lower end of a tubular drill stem, a core tube positioned w... | 09/21/1976 |
