...In 1790, the cost to obtain a patent was between $4 and $5.
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 6938356 | Drying machine A washing/drying machine has objects to shorten a time required for a washing operation, to improve a heat exchange capability in a radiator and an evaporator, and to shorten a drying time for things to be dried, and comprises: an accommodating chamber in which thin... | 09/06/2005 |
| 6365413 | Thin film thermal oxidative oil deposit testing device and method Thin film thermal oxidative engine oil or other oleaginous liquid deposit device has an oleaginous test liquid placement volume; a heatable depositor surface in liquid communication with the volume; a supply for at least one of an oxidant and another subs... | 04/02/2002 |
| 6309508 | Spinning disk evaporator Liquid organic material is controllably delivered to a receptacle located in the center of a heated surface capable of horizontally rotating about its central axis. As the heated surface rotates, material deposited within the central receptacle is forced ... | 10/30/2001 |
| 5810975 | Apparatus for extracting solid residue from a fluid by evaporation An apparatus for extracting solid residues from an aqueous slurry. The slurry is applied to the upper surfaces of disks that rotate in a hollow cylindrical vessel so that an evaporation enclosure is defined by the vessel and at least in part by the upper ... | 09/22/1998 |
| 5472575 | Vacuum and infra-red radiation solvent evaporation A rotary evaporator is described utilizing a magnetically driven fluorocarbon cylinder, operating within a solvent container, to create a thin solvent film for rapid evaporation without the usual requirement for rotating the entire solvent container assem... | 12/05/1995 |
| 4995945 | Counter-current gas-liquid contacting device A counter-current contacting device which includes a number of features which increase the efficiency and/or increase the pressure differential across the device is disclosed. Systems for reducing the alcohol content of an alcohol containing beverage or w... | 02/26/1991 |
| 4913777 | Solvent evaporator A rotary evaporator for laboratory scale solvent evaporative procedures is described. A magnetically driven fluorocarbon coated rotor, being open at its base and closed at its top, operating within a container for solvents, creates a thin film for rapid s... | 04/03/1990 |
| 4790911 | Solvent evaporator A rotary evaporator for laboratory scale solvent evaporative procedures is described. A magnetically driven fluorocarbon coated rotor, operating within a container for solvents, creates a thin film for rapid solvent evaporation without the usual requireme... | 12/13/1988 |
| 4613409 | High rate solar still and process A method and apparatus for purifying raw feedwater. The raw feedwater is directed into an evaporator module submerged in a solar pond or other body of heated liquid. The evaporator module includes a rotating housing through which a plurality of spaced apa... | 09/23/1986 |
| 4334952 | Multistage molecular evaporator with wiped off film and continuous redistillation A liquid seal for a multistage molecular evaporator which is in the form of an elongated vessel having convex evaporating surfaces for carrying out a continuous redistillation. The evaporator includes at least two vacuum stages superposed one over the oth... | 06/15/1982 |
| 3976804 | Powdered tea product and process for production Dried tea flakes are prepared by vacuum drum drying. A tea extract having a solids content of 40 to 55% is applied to a drum in a film having a thickness of up to 0.09 centimeters. The drum is maintained at an internal temperature of 95° to 125°C. Water... | 08/24/1976 |
| 3969183 | Vacuum dehydration of heat sensitive materials A method and apparatus for vacuum dehydrating heat sensitive liquid material, particularly fruit juices including citrus and tomato juices. A top loading, endless belt conveyor for the thin liquid film is disposed in a vacuum dehydrator chamber which is m... | 07/13/1976 |
| 3960725 | Method for sludge treatment Sludge containing metal hydroxide is first subject to a separation treatment where solid particles are removed, and then dewatered to obtain a greater concentration of the metal hydroxide. The dewatered sludge attains a thixotropic character whereupon it ... | 06/01/1976 |