Abstract: A hollow glass body includes a cylindrical main body portion having a first inside diameter, and a first end opening and a second end opening on opposite ends of the hollow glass body. The hollow glass body has a second inside diameter at the second end opening. The second inside diameter is smaller than the first inside diameter. A difference between the first inside diameter and the second inside diameter is at most 100 ?m.

Abstract: A glass tube is treated with laser cutting for separating a hollow glass body from the glass tube. A laser beam used for laser cutting is focused on a wall of the glass tube.

Abstract: Provided is a method of manufacturing a glass product including the following steps. An intermediate glass product is provided. A portion of the intermediate glass product is heated to a predetermined temperature. A tool and the heated portion of the intermediate glass product are brought into contact. Under a state that a tool contacts the heated portion, at least one of the tool and the intermediate glass product is rotated so that the tool and the intermediate glass product relatively rotate, wherein a part of the tool that contacts the heated portion comprises or is made of glassy carbon.

Abstract: Provided is a method of manufacturing a glass product including the following steps. An intermediate glass product is provided. A portion of the intermediate glass product is heated to a predetermined temperature. A tool and the heated portion of the intermediate glass product are brought into contact. Under a state that a tool contacts the heated portion, at least one of the tool and the intermediate glass product is rotated so that the tool and the intermediate glass product relatively rotate, wherein a part of the tool that contacts the heated portion comprises or is made of glassy carbon.

Abstract: A glass tube is treated with laser cutting for separating a hollow glass body from the glass tube. A laser beam used for laser cutting is focused on a wall of the glass tube.

Abstract: A hollow glass body comprises a cylindrical main body portion having a first inside diameter, and a first end opening and a second end opening on opposite ends of the hollow glass body. The hollow glass body has a second inside diameter at the second end opening. The second inside diameter is smaller than the first inside diameter. A difference between the first inside diameter and the second inside diameter is at most 100 ?m.

Abstract: A washer nozzle for a screen wash system of a motor vehicle has a pre-assembled structural unit of a jet insert and a check valve. This structural unit is pressed into a shaft of a housing. This makes the washer nozzle particularly easy to install.

Abstract: A washer nozzle for a screen wash system of a motor vehicle has a pre-assembled structural unit of a jet insert and a check valve. This structural unit is pressed into a shaft of a housing. This makes the washer nozzle particularly easy to install.

Abstract: A coating method for the internal coating of a hollow body which includes producing a plasma jet from a working gas, supplying at least one precursor material to the working gas and/or to the plasma jet, introducing the plasma jet through a first opening into an interior of the hollow body and depositing at least one reaction product of at least one precursor on an inner surface of the hollow body and/or on at least one layer arranged on the inner surface. The method is carried out at atmospheric pressure. Furthermore, the first internal coating takes place without an activation process directly after a production process of the hollow body, in which the hollow body is formed with the supply of heat.

Abstract: A coating process using a plasma beam is provided, wherein the coating contains nanozeolites loaded with dye.