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| Number | Title | Issue Date |
| 6685482 | Method and system for creating and evaluating quizzes Educational software using a computer and having a data storage system including a software module database management system and a user database management system. There is a quiz module database, maintained by the software module database management sys... | 02/03/2004 |
| 6540028 | Automatic condensate drain device A pressure operated normally closed control valve operates to open at a predetermined pressure between the system minimum and maximum pressures to open the valve and allow the discharge of condensate from the system which has a source of pressure to provi... | 04/01/2003 |
| 6315427 | Intuitive beam directing control device for use in light conveyance system A device for lighting arrangements for a ceiling, includes means providing a light beam above a ceiling, reflector means for intercepting and reflecting light beams and located above the ceiling, means for mounting the reflector means for movement around ... | 11/13/2001 |
| 5863115 | Decorative illumination system Illumination system with a light source and a surrounding cylindrical array of refracting elements producing spokes.... | 01/26/1999 |
| 5703563 | Anti-hijack system An anti-hijack system which includes a nozzle arranged to be normally hidden from view mounted on the front section of a vehicle in the window well of the front windshield in such manner that the spray therefrom will impinge upon a person outside the vehi... | 12/30/1997 |
| 5652991 | Hair brush cleaner and sanitizer A hair brush cleaner and sanitizer, having a hair remover section for removing hair from hair brushes placed into it. The hair remover section includes a pair of shafts with hair removing tines thereon, the shafts being mounted to rotate in opposite direc... | 08/05/1997 |
| 5440836 | Hydroponic device for plant cultivation A hydroponic device comprises a reservoir for containing culture fluid therein, one or more cultivation beds placed on the reservoir one above the other, a conduit extending vertically upwardly from the reservoir up to an uppermost cultivation bed and a f... | 08/15/1995 |
| 5251920 | Beam off-set roller skate Roller skates having a shoe or boot supported by a central support beam. The boot has an inside and outside corresponding to the inside and the outside of a user's foot to which it is designed to be removably attached. Each skate also has a first and seco... | 10/12/1993 |
| 4998785 | Decorative surface and a method of producing it A material has a reflective surface which bears a light diffracting pattern in the form of a series of well-defined grooves and ridges, wherein the transverse cross-section of the surface has a non-cyclical sequence of peaks and troughs. The pattern is pr... | 03/12/1991 |
