| Patent Number |
Title Of Patent |
Date Issued |
| 7345173 |
Work-up of the mother liquor obtained in the preparation of high-purity triethylenediamine |
March 18, 2008 |
| In a process for the purification of triethylenediamine (TEDA) in which TEDA is vaporized and the gaseous TEDA is passed into a liquid solvent and is subsequently crystallized from this, the mother liquor obtained after the TEDA has been crystallized is extracted with an extractant w |
| 7342139 |
Method for producing highly concentrated formaldehyde solution |
March 11, 2008 |
| A process for preparing a high-concentration formaldehyde solution by removing water from a lower-concentration formaldehyde solution having a formaldehyde content of from 5 to 50% by weight, in which the lower-concentration formaldehyde solution is fed to a preheater and heated in t |
| 7222529 |
Filling level sensor for a fuel tank of a motor vehicle |
May 29, 2007 |
| The invention relates to a filling level sensor for a fuel tank with a float which is fastened to a lever arm and at least one contact which is arranged on the lever arm and is in connection with a slider track formed as a thick-film resistor. The thick-film resistor consists of at least |
| 7151177 |
Process for the preparation of highly pure triethylene diamine |
December 19, 2006 |
| Highly pure triethylenediamine is obtained by a process in which triethylenediamine is freed from high boilers and then the triethylenediamine is vaporized from the mixture thus obtained and is passed into a liquid solvent. The process makes it possible in particular to obtain highly |
| 7132538 |
Isolation of high-purity triethylenediamine (TEDA) by distillation |
November 7, 2006 |
| Process for purifying triethylenediamine (TEDA) by disillation, in which the fractionation is carried out in a dividing wall column. |
| 7029557 |
Method for producing an aqueous hydroxylamine solution devoid of salt |
April 18, 2006 |
| The invention relates to a method for producing a highly pure, aqueous hydroxylamine solution by distilling an aqueous solution, devoid of salt, of a hydroxyl ammonium salt in a plate column comprising at least two mechanical plates. Said method is characterised in that packing bodies |
| 7017557 |
Feed device |
March 28, 2006 |
| In a feed device (2) for a motor vehicle, a ventilation element (10) is arranged in a feed line (7) which is guided into an intermediate tank (8) arranged upstream of a surge chamber (3). The ventilation element (10) has an opening (11) which is closed when the fuel is flowing and is |
| 6955158 |
Fuel container for a motor vehicle |
October 18, 2005 |
| In a fuel container (1) for a motor vehicle having a plurality of chambers (2, 4), a suction jet pump (18, 19) with a filling level sensor (11, 12) is arranged in each of the individual chambers (2, 4). A valve (24, 25) is arranged in a propellant line (20, 21) leading to the suction jet |
| 6942762 |
Method for the production of a salt-free aqueous hydroxylamine solution |
September 13, 2005 |
| A process for preparing a salt-free aqueous hydroxylamine solution by distilling an aqueous solution of a hydroxylammonium salt and a base in a tray column having at least two mechanical trays, wherein random or structured packings are located above at least one tray of the tray column |
| 6617047 |
Method for coating apparatuses and parts of apparatuses used in chemical manufacturing |
September 9, 2003 |
| The present invention relates to a process for coating apparatuses and apparatus parts for chemical plant construction--which are taken to mean, for example, apparatus, tank and reactor walls, discharge devices, valves, pumps, filters, compressors, centrifuges, columns, dryers, comminuti |
| 6552194 |
Process for the preparation of pure triethylenediamine (TEDA) |
April 22, 2003 |
| The invention relates to the preparation of pure triethylenediamine (TEDA) by evaporating TEDA from the mixture comprising a solvent or diluent, where the solvent or diluent has a boiling point at atmospheric pressure in the range from 175 to 250.degree. C., passing the vapor-form TEDA i |
| 6491180 |
Fuel tank |
December 10, 2002 |
| A fuel tank for a motor vehicle comprising a wall composed of two shells arranged one above the other. The outer shell of the wall preferably has an inlet orifice and an outlet orifice. A filter element is arranged in front of the outlet orifice. Scavenging air from the inlet orifice the |
| 6463965 |
Arrangement for storing fuel and method for operating a fuel tank |
October 15, 2002 |
| A fuel tank having an inlet and an outlet is connected to a separate pressure vessel by means of a pump. Fuel vapors are pumped out of the tank and into the pressure vessel while the tank is being filled via the inlet, so that fuel vapors cannot escape during filling. After filling, the |
| 6422213 |
Delivery device for delivering fuel |
July 23, 2002 |
| A delivery device (2) for delivering fuel, having a delivery pump (3) and a fuel filter (7), has a bypass line (9) which is conducted past the fuel filter (7). When new, the delivery pump (3) delivers fuel through the fuel filter (7). After the fuel filter (7) has become clogged with dir |
| 6409040 |
Fuel tank for a motor vehicle |
June 25, 2002 |
| A fuel tank for a motor vehicle, having a wall (3) which is manufactured from plastic, in particular by injection molding, is provided on its inside with a permeation barrier (4). The permeation barrier (4) is manufactured from a material which is virtually impenetrable for fuel vapo |
| 6395215 |
Method of producing a plastic component and fuel tank for a motor vehicle |
May 28, 2002 |
| In a method of producing a fuel tank from plastic, a heating element is located between two shell parts to be welded to one another. When the shell parts are pressed together, the heating element melts into the plastic and produces a weld that provides a fuel-resistant seal. The fuel |
| 6279544 |
Pressure-maintaining arrangement |
August 28, 2001 |
| In a pressure-maintaining device for a fuel supply system of an internal combustion engine (1) of a motor vehicle, a pressure reservoir (5) is arranged in a supply line (7) leading to the internal combustion engine (1). The pressure reservior (5) has a pressure chamber (13), which is |
| 6263916 |
Tank system |
July 24, 2001 |
| In a tank system, in particular a fuel tank system, which comprises a tank (1) with at least one filling level transmitter (7, 8) and also a display (11) for indicating the filling level of the tank (1), a measurable and indicatable reserve volume (3V) which is arranged in the tank and i |
| 6250328 |
Device for supplying an internal combustion engine of a motor vehicle with fuel |
June 26, 2001 |
| A device for supplying an internal combustion engine (1) of a motor vehicle with fuel has a return line (4) which is passed into a fuel tank (2) and has a wall made of a material of high thermal conductivity. The return line (4) is arranged within a ventilation duct (5). Cooling air is |
| 4841451 |
System for measuring the duration ratio of pulses of variable frequency |
June 20, 1989 |
| In a system for measuring the duration ratio of pulses of variable frequency, particularly in electronically controlled fuel-injection systems for internal-combustion engines, there are derived clock pulses to the frequency of which a predetermined multiple of the frequency of the pu |
