Magician Harry Houdini patented a "Diver's Suit" enabling the wearer to "quickly divest himself of the suit while being submerged and to safely escape and reach the surface of the water."
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AbstractA process for making low cost drip irrigation lines comprises molding a drip emitter having an elongated labyrinthine channel formed in the depth of the emitter body. Emitters of other configurations also can be used in the process. A plastic film is extruded and passed through a film die with an air injection tube at one end forming a plastic film bubble. At the bottom of the extruded plastic film bubble a pair of pressure rolls join opposite faces of the bubble to form a continuous unitary extruded plastic film sheet. The emitters are moved in series toward the nip of the pressure rolls and are inserted in sequence with their labyrinthine faces facing toward the hot bubble. The emitters are bonded to the extruded film sheet using the heat of extrusion, and the external sheet forms one face of the labyrinthine channel through each emitter. After laminating the emitter to the extruded film, an exit hole is formed through the film to each emitter and the film is then wrapped and bead sealed to form a continuous flexible drip irrigation tube with the emitters spaced apart along the inside of the tube. The process can be used for making multiple drip irrigation lines in parallel along a single extruded plastic film sheet. | InventorsAssigneeApplicationNo. 339593 filed on 11/14/1994US Classes:156/244.13, Hollow article or lamina156/203, And edge-joining of one piece blank to form tube156/218, Hollow cylinder article156/244.22, Bonding spaced preforms156/244.27, Pressure assisted bonding239/542, CONDUIT OR NOZZLE ATTACHED IRRIGATION-TYPE DECELERATOR264/171.12Hollow preformField of Search239/542, CONDUIT OR NOZZLE ATTACHED IRRIGATION-TYPE DECELERATOR239/547, DISTRIBUTOR OR NOZZLE IN CIRCUMFERENTIAL WALL OF FLEXIBLE SUPPLY LINE156/244.13, Hollow article or lamina156/244.19, After bonding; e.g., as finishing step, etc.156/244.22, Bonding spaced preforms156/244.24, Post-treatment156/244.27, Pressure assisted bonding156/203, And edge-joining of one piece blank to form tube156/218, Hollow cylinder article264/209.3, Reshaping product (extrudate) subsequent to extrusion264/171.12, Hollow preform264/172.1Having particular noncircular cross-section (e.g., T-configured, etc.)ExaminersPrimary: Stemmer, DanielAttorney, Agent or FirmUS Patent References3896999, 4060200, Drip level irrigationIssued on: 11/29/1977 Inventor: Mehoudar4285472, Water dropping type irrigation pipe Issued on: 08/25/1981 Inventor: Okada , et al.4307841, Drip irrigation system Issued on: 12/29/1981 Inventor: Mehoudar , et al.4417936, Plastic web with multiplicity of gas filled bubbles, containing printing thereon and method of making same Issued on: 11/29/1983 Inventor: Gaffney4474330, Drip irrigation conduit and method of making the same Issued on: 10/02/1984 Inventor: Langa4541569, Drip irrigation conduit and method of making the same Issued on: 09/17/1985 Inventor: Langa4880167, Irrigation hose with linear turbulent flow emitter Issued on: 11/14/1989 Inventor: Langa, et al.5052625, Pressure compensating drip irrigation system Issued on: 10/01/1991 Inventor: Ruskin5192027, Drip irrigation devices and plastic films with copper powder incorporated Issued on: 03/09/1993 Inventor: Delmer, et al.5252162, Multiple chamber drip irrigation hose made from a single strip Issued on: 10/12/1993 Inventor: Delmer5310438Process for making low cost drip irrigation lines using plastic extrusion and film blowing techniques Issued on: 05/10/1994 Inventor: Ruskin International ClassesB29C 047/02B05B 015/00 |