Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
PatentStorm News
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 |
| 5137685 | Machinable copper alloys having reduced lead content Machinable copper alloys having a reduced lead concentration are disclosed. An additive to the alloy accumulates both at the grain boundaries and intragranularly. The additive facilitates chip fracture or lubricates the tool. One additive is a mixture of ... | 08/11/1992 |
| 5026433 | Grain refinement of a copper base alloy A method of producing a grain refined copper base alloy containing iron in the amount of less than 2.3% by weight and which is cast into an ingot by conventional direct chill casting. Calcium is added to the melt before casting, preferably in the form of ... | 06/25/1991 |
| 5004520 | Method of manufacturing film carrier There is provided a film carrier comprising a resin base film and a rolled copper foil laminated thereon, said rolled copper foil forming leads for mounting semiconductor chips or other electronic components in place, characterized in that said rolled cop... | 04/02/1991 |
| 4971758 | Copper-based alloy connector for electrical devices A copper-based alloy connector excellent in electrical conductivity, adherence of solder of the connector when bent, high-temperature creep strength, and migration resistance, consists essentially by weight percent of 0.5 to 3% Ni, 0.1 to 0.9% Sn, 0.08 to... | 11/20/1990 |
| 4935076 | Copper alloy for use as material of heat exchanger A copper alloy suitable for use as the material of a heat exchanger contains 1 to 4.5 wt % of Zn, 1.0 to 2.5 wt %, preferably 1.5 to 2.0 wt % of Sn, 0.005 to 0.05 wt %, preferably 0.01 to 0.04% of P, and the balance substantially Cu and inevitable impurit... | 06/19/1990 |
| 4886641 | Electrical contact spring material made of copper base alloy of high strength and toughness with reduced anisotropy in characteristics A novel electrical contact spring material made of a copper base alloy is disclosed. This spring material has high strength and toughness, as well as good adhesion of solder. It also has reduced anisotropy in its characteristics in two directions, i.e., t... | 12/12/1989 |
| 4872048 | Semiconductor device having copper alloy leads A semiconductor device having leads of high strength and elongation and which consist essentially of a copper alloy that contains 0.05-1% of Cr, 0.005-0.3% of Zr, 0.001-0.05% of Li, 0-1% of Ni, 0-1% of Sn, 0-1% of Ti, 0-0.1% of Si and 0.001-0.3% of at lea... | 10/03/1989 |
| 4822562 | Copper alloy excellent in migration resistance A copper alloy excellent in migration resistance comprising from 0.05 to 0.20% by weight of Fe, from 0.02 to 0.05% by weight of P, from 1.0 to 5.0% by weight of Zn, less than 2.5% by weight of Sn and the substantial balance of Cu and impurities. The coppe... | 04/18/1989 |
| 4751049 | Connector and alloy Connectors which are essentially, by weight, 85% to 93% copper, with silicon in the amount of 1.5% to 2.5% is disclosed. The balance of the material is zinc, desirably in the range of 5% to 12%. Trace elements of tin, lead and aluminum can be tolerated bu... | 06/14/1988 |
| 4749548 | Copper alloy lead material for use in semiconductor device Copper alloy lead materials used in the fabrication of semiconductor devices such as ICs and LSIs are required to have a tensile strength of 40 kgf/mm2 or more, an elongation of 4% or more, an electrical conductivity of 50% IACS or more, and a ... | 06/07/1988 |
| 4743427 | High potent and high electroconductive copper alloy suitable for fin material of heat-exchanger A high electroconductive copper alloy is disclosed which contains 0.003 to 1.0 wt % of Zn, 0.005 to 0.1 wt % of Mg and the remainder of Cu. Not more than 0.1 wt % of the total amount of either one or more of Cr, Mn, Fe, Co, Ni, Y, Sn, Si and Zr may be con... | 05/10/1988 |
| 4741394 | Radiator for motor cars In a radiator for motor cars wherein fins are fitted between vertical tubes through which the heat-exchanging medium flows to form a core and tube plates are provided at both ends of the tubes of said core to connect with a resinous tank, a concave groove... | 05/03/1988 |
| 4732732 | Migration resistant phosphor bronze alloy A phosphor bronze alloy excellent in migration resistance, which containing from 3.0 to 9.0% by weight of Sn, from 0.03 to 0.35% by weight of P, from 1.0 to 5.0% by weight of Zn, and the substantial balance of Cu and impurities. The phosphor bronze alloy ... | 03/22/1988 |
| 4668471 | Copper alloy lead material for leads of a semiconductor device A copper alloy lead material for leads of a semiconductor device, which consists essentially of from 2 to 2.4 percent by weight iron, from 0.001 to 0.1 percent by weight phosphorus, from 0.01 to 1 percent by weight zinc, from 0.001 to 0.1 percent by weigh... | 05/26/1987 |
| 4642146 | Alpha copper base alloy adapted to be formed as a semi-solid metal slurry A copper base alloy capable of forming a microstructure comprising a plurality of discrete particles in a surrounding metal matrix having a lower melting point than the particles. The alloy consists essentially of from about 3% to about 6% nickel, from ab... | 02/10/1987 |
| 4631237 | Wire electrode for spark-eroding systems A wire electrode for a spark-eroding system for erosion cutting of workpieces using intermittent electrical charges includes a core of a current-conducting material and a wire coating of a material with a lower evaporation temperature, for example zinc. T... | 12/23/1986 |
| 4587097 | Homogeneous low melting temperature brazing filler metal for joining ferrous and non-ferrous alloys A metal alloy consisting essentially of about 4-16 atom percent manganese, 4-16 atom percent silicon, 0-16 atom percent tin, 0-20 atom percent zinc, 0-10 atom percent silver and about 0-10 atom percent indium, the balance being copper and incidental impur... | 05/06/1986 |
| 4407776 | Shape memory alloys A shape memory alloy consisting essentially of, by weight ratio, 2 to 15% aluminium, 0.01 to 3% beryllium and the balance being substantially copper, with impurities being inevitably present in the process of preparation, and a shape memory alloy further ... | 10/04/1983 |
| 4309214 | Manufacture of metal powder A system for producing metal powder in which a cryogenic fluid in the liquid phase is poured over a metal bath having a vapor pressure of at least 1 mm Hg, and the solid particles suspended in the fluid are separated therefrom and collected. The particles... | 01/05/1982 |
| 4269623 | Copper alloy for reliable electrical connection This invention relates to a copper alloy for reliable electrical connection comprising 0.5-3.0 wt% of Fe, 0.3-0.8 wt% of Zn and the balance being composed of Cu and impurities thereof, which is characterized by that it excels in connecting characteristics... | 05/26/1981 |
| 4207096 | Method of producing graphite-containing copper alloys A method of producing a copper-graphite particles composite alloy having good mechanical properties and good wear resistant property, which comprises preparing a metal of copper base alloy containing 0.1 to 10% by weight of Ti, Cr, Zr and/or Mg, dispersin... | 06/10/1980 |
| 4139378 | Powder-metallurgy of cobalt containing brass alloys The properties of brass powder compacts are improved by including selected amounts of cobalt in the brass powder compositions; specifically brass powder compacts broadly comprising about 5% to about 45% zinc, about 1% to about 7% cobalt, balance essential... | 02/13/1979 |
| 4131453 | Pyrometallurgical brass production Waste materials containing significant quantities of zinc oxide are mixed with carbon and a sufficient amount of copper to set the overall Zn/Cu weight ratio to a selected value below 0.66. The mixture is loaded into the top of a shaft furnace having a lo... | 12/26/1978 |
| 4128418 | Enhanced grain growth in arsenic modified copper-zinc brasses A copper-zinc brass alloy is disclosed which exhibits enhanced grain growth characteristics when modified with from 0.02 to 0.80 percent by weight arsenic.... | 12/05/1978 |
| 4094671 | Gold color copper alloy for restorative dentistry A copper alloy having a gold color and being particularly suitable for restorative dentistry and consisting essentially of copper, zinc and a small amount of zirconium. Other additions may be included in the alloy.... | 06/13/1978 |
| 4067752 | Austenitic aging of metallic compositions Some metallic compositions that undergo a reversible transformation between austenitic and martensitic states as a result of being heated or cooled through critical temperature ranges may lose a portion or all of the ability to revert from martensite to a... | 01/10/1978 |
