The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7265323 | Electrically conductive heated glass panel assembly, control system, and method for producing panels An electrically conductive heated glass panel assembly, control system, and method for producing panels are provided to warm objects and to insure unobstructed viewing through glass by removing moisture. An integrated connection circuit interconnects glass sheets, w... | 09/04/2007 |
| 7218847 | Heating unit for heating a workpiece with light-absorbing heat conducting layer A heating unit heats a work piece 6 by heat conduction from a heat conducting plate 4 on which light from a light source 1 is irradiated, wherein the heat conducting plate 4 comprises a holding member 2 having optical transparency,... | 05/15/2007 |
| 5241158 | Electric hotplate In the case of an electric hotplate (1), the profile ring (17) for supporting on the hob (2) is provided by an elastically resilient circumferential stretching and a resilient cross-sectional zone (29) with an outer ring leg (18) resiliently deflectable w... | 08/31/1993 |
| 5162636 | Electric cooking means In a glass mounting plate, which is provided on the underside with a partly transparent and partly non-transparent mask, is fitted an electric hotplate. An illuminating chamber illuminating by a lamp is connected to its underside. The mask gives rise to a... | 11/10/1992 |
| 5160830 | Electric hotplate For an electric hotplate is provided an assembly arrangement using a bearing ring, which forms a continuous, one-piece, smooth-surface top extending from the outermost circumferential area of the hotplate body located close to the cooking surface to its o... | 11/03/1992 |
| 5028762 | Electric hotplate For an electric hotplate (2) is provided an assembly arrangement (1) using a bearing ring (10), which forms a continuous, one-piece, smooth-surface top extending from the outermost circumferential area of the hotplate body (23) located close to the cookin... | 07/02/1991 |
| 5010235 | Electric cooker plate An electric cooker consisting of a fitting plate having an opening surrounded by an upwardly directed rim, a cooker plate received in the opening, the plate having a cooking surface on which a cooking vessel can be placed, and a sheet metal ring surroundi... | 04/23/1991 |
| 4906819 | Hold-down clip for electric range surface elements A hold down or retaining clip is provided for removably securing a supporting spider for a heating element to a top wall of an appliance such as an electric range. Generally in such appliance there is a burner bowl in which the spider and heating element ... | 03/06/1990 |
| 4861969 | Electric hotplate, apparatus and method for fitting a cover plate thereto The lower cover plate of an electric hotplate is fixed to the hotplate body by a resilient fixing structure provided on the cover plate, engaging with gripping edges on the outer face of a downwardly directed, central cast pin. The fixing structure can be... | 08/29/1989 |
| 4829160 | Electric cooker plate An electric cooker comprises a fitting plate having an opening surrounded by an upwardly directed rim, a cooker plate received in the opening, the plate having a cooking surface on which a cooking vessel can be placed, and a sheet metal ring surrounding t... | 05/09/1989 |
| 4804822 | Mounting device for an electric cooker plate A mounting device for an electric cooker plate in which the relatively heavy cooker plate (11) is so mounted in a stove top plate (19) of glass, that even during transportation, destruction of the glass stove top plate under lateral impacts will not, or i... | 02/14/1989 |
| 4767915 | Solid plate plug-in heating element A solid plate plug-in top surface heating element which is interchangeable with a shielded spiral wire surface heating element. Rigid conductors connect to the ends of the resistive wire heating element on the underside of the solid plate top disk. The ri... | 08/30/1988 |
| 4766290 | Sealed electric hotplate A sealed electric hotplate is to be provided, which can be simply fitted by lateral insertion into a hob. For this purpose a hotplate with a cast metal body is surrounded by a very wide trim ring, which is provided with centering projections. The wide rin... | 08/23/1988 |
| 4755655 | Thermal protection arrangement for solid disk glass cooktop A solid disk surface unit mounted in a glass or ceramic support surface, comprising a plate member of cast material with one or more resistive heating elements mounted to the underside thereof and a thermally conductive cover member enclosing the undersid... | 07/05/1988 |
| 4506141 | Reduced size heating assembly for an electric stove A heating assembly having a heating element including a coil portion having a substantially circular array and dimensioned to be substantially smaller than the surface aperture on the cooking surface of an electric stove in which it is mounted. An adaptor... | 03/19/1985 |
| 4491722 | Mounting arrangement for an electric hotplate with a support ring surrounding it A conventional electric hotplate with a sheet metal supporting ring surrounding the same is fitted into a glass or ceramic built-in plate, while using an intermediate ring, whose outer rim rests on the built-in plate, while the support ring is supported t... | 01/01/1985 |
| 4490603 | Electric hotplate with a mounting ring around it A hotplate is fitted by means of a relatively wide and shallow mounting ring, whose outer edge rests on a mounting plate made from glass, ceramic or other materials. At its edge, the mounting ring is adhered to mounting plate using a thermally stable adhe... | 12/25/1984 |
| 4013870 | Terminal block mounting for a plug-in surface heating unit A plug-in surface heating unit assembly for use in the cooktop of an electric range. The heating unit is a metal sheathed electrical resistance heating element in spiral form with radial, outwardly directed terminal portions in close formation. The invent... | 03/22/1977 |
| 4009795 | Combined reflector pan and trim ring An electric range for household cooking purposes has a cooktop with a plurality of surface heating units in the form of coils of metal-sheathed, electrical resistance heating elements. Each unit is mounted in an opening in the cooktop. A combined reflecto... | 03/01/1977 |