Patents by Inventor Wilhelmus M. P. Van Kemenade
Wilhelmus M. P. Van Kemenade has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6525473Abstract: A low-pressure mercury-vapor discharge lamp is provided with a discharge vessel and a first and a second end portion (12a). The discharge vessel encloses a discharge space provided with a filling of mercury and an inert gas in a gastight manner. Each end portion (12a) supports an electrode (20a) arranged in the discharge space. An electrode shield (22a) encompasses at least one of the electrodes (20a) and is made from a ceramic material. Preferably, the electrode shield (22a) is tubular in shape with a lateral slit directed towards the discharge space. The lamp according to the invention has a comparatively low mercury consumption.Type: GrantFiled: November 5, 2001Date of Patent: February 25, 2003Assignee: Koninklijke Phillips Electronics N.V.Inventors: Cornelis J. M. Denissen, Cornelis R. Ronda, Wilhelmus M. P. Van Kemenade, Henricus P. M. Gubbels
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Publication number: 20020074942Abstract: A low-pressure mercury-vapor discharge lamp is provided with a discharge vessel and a first and a second end portion (12a). The discharge vessel encloses a discharge space provided with a filling of mercury and an inert gas in a gastight manner. Each end portion (12a) supports an electrode (20a) arranged in the discharge space. An electrode shield (22a) encompasses at least one of the electrodes (20a) and is made from a ceramic material. Preferably, the electrode shield (22a) is tubular in shape with a lateral slit directed towards the discharge space. The lamp according to the invention has a comparatively low mercury consumption.Type: ApplicationFiled: November 5, 2001Publication date: June 20, 2002Applicant: U.S. PHILIPS CORPORATIONInventors: Cornelis J.M. Denissen, Cornelis R. Ronda, Wilhelmus M.P. Van Kemenade, Henricus P.M. Gubbels
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Patent number: 6359385Abstract: A low-pressure mercury-vapor discharge lamp is provided with a discharge vessel and a first and a second end portion (12a). The discharge vessel encloses a discharge space provided with a filling of mercury and an inert gas in a gastight manner. Each end portion (12a) supports an electrode (20a) arranged in the discharge space. An electrode shield (22a) encompasses at least one of the electrodes (20a) and is made from a ceramic material. Preferably, the electrode shield (22a) is tubular in shape with a lateral slit directed towards the discharge space.Type: GrantFiled: May 4, 1999Date of Patent: March 19, 2002Assignee: U.S. Philips CorporationInventors: Cornelis J. M. Denissen, Cornelis R. Ronda, Wilhelmus M. P. Van Kemenade, Henricus P. M. Gubbels
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Patent number: 6274981Abstract: A low-pressure mercury vapor discharge lamp is provided with a discharge vessel and a first and a second end portion (12a). The discharge vessel encloses a discharge space provided with a filling of mercury and a rare gas in a gastight manner. Each end portion (12a) supports an electrode (20a) arranged in the discharge space. An electrode shield (22a) encompasses the electrodes (20a) and is covered with a material which reacts with or forms an alloy with alkaline earth metals, which material is released by the electrode (20a).Type: GrantFiled: May 4, 1999Date of Patent: August 14, 2001Assignee: U.S. Philips CorporationInventors: Cornelis R. Ronda, Cornelis J. M. Denissen, Volker U. Weiler, Wilhelm A. Groen, Wilhelmus M. P. Van Kemenade, Bennie J. De Maagt
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Patent number: 6150757Abstract: A luminescent material coated with a crystalline layer of a metal oxide M.sub.2 O.sub.3 wherein a metal M is chosen from the group formed by Y and Al is shown. According to this method the luminescent material is first introduced into a solution of a salt of the metal M, then a compound of the metal M is deposited on the luminescent material through homogeneous precipitation, and subsequently the luminescent material is separated from the solution, dried, and heated. It is achieved thereby that the luminescent material will absorb mercury to a low degree only, and that accordingly the color point of a low-pressure mercury discharge lamp whose luminescent layer comprises a luminescent material coated in accordance with the invention only shows a small shift as the lamp ages.Type: GrantFiled: June 19, 1998Date of Patent: November 21, 2000Assignee: U.S. Philips CorporationInventors: Cornelis R. Ronda, Volker U. Weiler, Annette Johnen, Johannes A. F. Peek, Wilhelmus M. P. Van Kemenade
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Patent number: 6049164Abstract: A discharge vessel (10) encloses a discharge space (12) in a gastight manner, electrodes (21a, 21b) being arranged in the space and having a first (22a, 22b) and a second fastening (22a', 22b'). At least one of the electrodes (21a) is surrounded by a screen (23) which has a smallest width W, in a plane transverse to the tube axis (11) and transverse to the direction from the first (22a) to the second fastening (22a'), which width is smaller than the distance D between the fastenings (22a, 22a'). The screen (23a) has a length L in the direction of the tube axis (11) which lies between once and three times the smallest width W. The lamp consumes comparatively little mercury in the case of cold ignition.Type: GrantFiled: March 25, 1998Date of Patent: April 11, 2000Assignee: U.S. Philips CorporationInventors: Wilhelmus M. P. Van Kemenade, Pieter J. C. Van Der Wel
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Patent number: 5811154Abstract: The invention relates to a method of coating a luminescent material with a layer of a metal oxide M.sub.2 O.sub.3 wherein a metal M is chosen from the group formed by Y and Al. The invention also relates to a coated luminescent material and to a low-pressure mercury discharge lamp.According to the invention, the luminescent material is first introduced into a solution of a salt of the metal M, then a compound of the metal M is deposited on the luminescent material through homogeneous precipitation, and subsequently the luminescent material is separated from the solution, dried, and heated.It is achieved thereby that the luminescent material will absorb mercury to a low degree only, and that accordingly the color point of a low-pressure mercury discharge lamp whose luminescent layer comprises a luminescent material coated in accordance with the invention only shows a small shift as the lamp ages.Type: GrantFiled: August 8, 1995Date of Patent: September 22, 1998Assignee: U.S. Philips CorporationInventors: Cornelis R. Ronda, Volker U. Weiler, Annette Johnen, Johannes A. F. Peek, Wilhelmus M. P. Van Kemenade
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Patent number: 5801482Abstract: A low-pressure mercury vapor discharge lamp according to the invention is provided with a discharge vessel having a tubular portion and a first and a second end portion. The discharge vessel encloses a discharge space provided with a filling of mercury and a rare gas in a gastight manner. Each end portion supports an electrode which is arranged in the discharge space. Current supply conductors extend from the electrodes through the end portions to outside the discharge vessel. The tubular portion of the discharge vessel is provided with a metal oxide layer on a surface which faces the discharge space. The first and the second end portion are also provided with metal oxide layers at surfaces which face the discharge space. The lamp according to the invention has a comparatively low mercury consumption.Type: GrantFiled: August 17, 1995Date of Patent: September 1, 1998Assignee: U.S. Phillips CorporationInventors: Henricus C.G. Verhaar, Henriette J. Talen-Van Der Mheen, Christianus J. Roozekrans, Wilhelmus M.P. Van Kemenade
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Patent number: 4806823Abstract: The invention relates to an electron beam tube for displaying color television pictures and to a method of manufacturing same, in which a graphite suspension substantially free from alkali metal ions and comprising colloidal silicon oxide is used for making contact between the color selection electrode and the phosphor pattern on the display window. This suspension enables a method of manufacture which is simpler than the conventional methods.Type: GrantFiled: October 16, 1987Date of Patent: February 21, 1989Assignee: U.S. Philips CorporationInventors: Johannes M. A. A. Compen, Wilhelmus M. P. Van Kemenade
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Patent number: 4550032Abstract: An electrically conductive layer on a wall portion of the envelope of an electric discharge tube which comprises an electrically conductive material and at least 5% by weight of silicon dioxide as an adhesive, adheres readily, is hard and can be washed with water.Such a layer can be obtained from a suspension comprising an electrically conductive material and a binder in a solvent, in which the binder is a quaternary ammonium silicate or a solution of silicon dioxide (SiO.sub.2) in phosphoric acid (H.sub.3 PO.sub.4), in which the mol ratio SiO.sub.2 /P.sub.2 O.sub.5 is between 0.3:1 and 20:1.Type: GrantFiled: March 1, 1984Date of Patent: October 29, 1985Assignee: U.S. Philips CorporationInventors: Johannes M. A. A. Compen, Wilhelmus M. P. van Kemenade