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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 6910232 | Toilet tank valve A toilet tank flushing system including a ballcock valve for maintaining a storage level of water in the tank, a tank valve to release stored water on demand, and a linkage system which requires a reduced physical effort to initiate flushing. A hollow, open-ended cl... | 06/28/2005 |
| 6804843 | Flush tank capable of receiving waste water A flush tank includes a water entrance to receive water from a water reservoir, a water outlet for discharging the water and controlled by a valve member, and a water inlet disposed in the upper portion to receive waste water from waste water suppliers. A valve devi... | 10/19/2004 |
| 5699563 | Float-controlled dual flush valve A dual flush valve that can be operated in a partial flush mode to release only about half of the tank water to the toilet bowl, or in a full flush mode to release almost all of the tank water, is of simple and reliable construction. For a partial flushin... | 12/23/1997 |
| 5179739 | Water conserving toilet assembly A toilet flushing apparatus designed to prevent excess loss of water that may happen when the flush valve stays open as the inlet valve is putting water into the tank. The initial flushing lifts the flush valve which acts in conjunction with a counter-wei... | 01/19/1993 |
| 5004462 | Adjustable water-level flushing apparatus A toilet flushing apparatus (10) that conserves water by providing either a low-level water flush for liquid waste or a full-level flush for solid waste. The apparatus (10) consists of a water-level release assembly (12) that is attached to a toilet overf... | 04/02/1991 |
| 4907302 | In-field installable closing delay cup An improvement is provided for toilet flush valves on tanks which contain insufficient water to flush properly, which leads to waste of water by double flushing. The improvement enables in-field modification of the flush valve to substantially completely ... | 03/13/1990 |
| 4868933 | Flush control devices A flush control device for controlling the flush operation of a flush toilet having a cistern, a feed water control mechanism fluidly coupled to a water supply pipe and a flush water control mechanism fluidly coupled to one end of a flush pipe, the opposi... | 09/26/1989 |
| 4852191 | Toilet An improved toilet with a bowl and a flusher wherein the improvement includes a toilet water tank which contains an insert for creating a first compartmemt filled with a deodorant and a second compartment filled with a fluid, and an actuator which is pivo... | 08/01/1989 |
| 4764995 | Dual flush mechanism A dual flush mechanism which allows the user to select either a full or partial flush, while using a single flush valve. A full flush is obtained by a first handle which lifts a flush valve actuating arm to unseat the flush valve in a conventional manner.... | 08/23/1988 |
| 4710986 | Outlet valve for toilet tank A floatless outlet valve comprises a valve body having a vertically disposed overflow tube and a valve seat formed integrally at the lower end of the tube. A valve assembly is pivotably connected to the terminal end of the overflow tube by the rear end po... | 12/08/1987 |
| 4698859 | Flapper flush valve assembly A flapper valve assembly including an adapter member and a flapper valve member. The adapter member includes a collar portion, a pair of trunions projecting radially outwardly from diametrically opposed locations on the collar portion, and a mounting port... | 10/13/1987 |
| 4483024 | Variable flush water closet An overflow pipe in a water closet supports a valve arm which carries a valve for opening and closing an outlet in the bottom of the tank. A first float is connected to the outer end of the valve arm to maintain the valve in an open position until the wat... | 11/20/1984 |
| 4365364 | Toilet flush control using a hollow crown instant close flapper valve A demand type flush tank control for saving water by the utilization of a water release valve of the flapper type in the water storage tank of a toilet, with such flapper valve being non-buoyant such that it will close off the flow of water from the tank ... | 12/28/1982 |
| 4232408 | Two variable flush gate for lavatory reservoir Disclosed herein is a two variable flush gate for a flush toilet. It is a structure that, by means of adding and altering parts of elements in a traditional flush gate, can select a discharge quantity with simple operation of the discharge lever as needed... | 11/11/1980 |
| 4171547 | Toilet-blow flush system and devices therefor A device for converting a single volume cistern into a cistern allowing both low-volume and high-volume flushes. The device includes a hollow vessel inserted in the cistern and at least partially surrounding the flushing mechanism and water outlet. An ope... | 10/23/1979 |
| 4134165 | Flush toilet accessory This invention provides an attachment for use with a flush toilet mechanism with the usual stopper and a cylindrical float member horizontally disposed, both being fixed with respect to each other and being swingable about a horizontal axis parallel with ... | 01/16/1979 |
| 4117556 | Flush water conserver A flush water conserver adapted for easy retrofitting to existing standard toilet flush tanks is disclosed. The standard trip lever fixed to the pivot shaft of the toilet operating handle is replaced with a trip lever mounted on a pivot which is located b... | 10/03/1978 |
| 4106136 | Toilet flush flow accelerator A device usable in a toilet flush tank having a bottom wall opening comprises: (a) a tubular body adjustably located in drain communication with said opening and having an inlet spaced above the level of said opening so that only tank water above the leve... | 08/15/1978 |
