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...that "patent leather" got its name because the process of applying the polished black finish to leather was once patented?
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| Number | Title | Issue Date |
| 7832971 | Threaded element A threaded element (1) is provided having at least two slots (3), notches, grooves or the like that intersect the thread (2). The slots (3), notches, grooves or the like are configured in relation to the thread (2) so that they int... | 11/16/2010 |
| 7654785 | Higher fastening screw The present invention pertains to a high-speed fastening screw comprising a plurality of concavities on the threads connected in sequence in a single helix. Further, the concavities separately located adjacent to the screw head and to the drilling portion are dispos... | 02/02/2010 |
| 7264431 | Fastener for cover member and cover assembly comprised thereof A rigid fastener, for securing to one another adjacent portions of a cover member made of resiliently deformable material, has an end portion with an outward end section of relatively small outside diameter and an axially adjacent inward section of relatively large ... | 09/04/2007 |
| 7207761 | Pin fastener for achieving metal-to-metal connections A new and improved fastener for fastening together thin gauge sheet metal components comprises a forwardly extending pointed tip portion having a tangent ogive configuration so as to facilitate the fast and accurate penetration of the fastener into and through the t... | 04/24/2007 |
| 7163366 | Screw with two types of threads A screw includes a first thread on the shank and located close to the point of the shank, and a second thread which is connected to the first thread and extends toward the head of the screw. Each of the first and second threads includes an upper flank and a lower fl... | 01/16/2007 |
| 7108607 | Helical groove fasteners and methods for making same Helical groove fasteners and methods for producing the same are provided for use in systems requiring fluid passage through the fastener. In one embodiment, the fastener includes a shank, a head, a threaded portion, and at least one groove extending through at least... | 09/19/2006 |
| 7101133 | Thread-forming screw fastener The invention relates to a screw fastener comprising a threaded shank having a force application means for torque transmission and a screw fastener point. The threaded shank consists of a shank core and a self-tapping thread, and the thread is designed as a prominen... | 09/05/2006 |
| 7040851 | Fastening element A nail-shaped fastening element including a first, conical section (1, 11 21) tapering in a setting direction of the fastening element and having a shaped surface profile extending at least along a portion of the first section, and a second section (2, 12,... | 05/09/2006 |
| 7017952 | Fluid connector The present invention relates to a fluid connector, comprising a shaft having at least one solid shaft element and a plurality of connector surfaces, wherein the plurality of connector surfaces includes a surface with a plurality of threads and a plurality of groove... | 03/28/2006 |
| 6979163 | Push-in removable fastener A plastic push-in or drive fastener having a enlarged head and a shank is disclosed. The fastener is configured to allow the shank to be pushed through a complementary shaped aperture or opening in an article using a relatively low insertion force. A helical screw o... | 12/27/2005 |
| 6956181 | Method for making a fastener In accordance with one embodiment, the present technique provides a method for making a threaded fastener. The method includes that act of forming a die-making tool having surface features that correspond to the desired crest and flank profiles of a thread of the th... | 10/18/2005 |
| 6789991 | Screw A screw includes a rod-shaped portion, and a spiral-shaped thread winding around the rod-shaped portion. The rod-shaped portion has a straight portion, and a front end portion tapering towards a pointed front end. Several cutting trenches are formed on the rod-shape... | 09/14/2004 |
| 6659699 | Lockbolt for forming a mechanically secured and sealant sealed connection between components A lockbolt includes a bolt head, a shank, a locking portion, a predetermined breaking point, and a break-away portion. The locking portion includes a knurled surface having knurling peaks between intersecting knurling grooves that extend in a direction wi... | 12/09/2003 |
| 5882161 | Self-drilling and thread-forming screw having a flow-forming section A self-drilling and thread-forming screw comprises a threaded shank, a drilling section arranged in front of the shank and having a uniform diameter, and a thread-free flow-forming section widening conically between the drilling section and the shank. The... | 03/16/1999 |
| 5759003 | Combined screw and clearance drill A combination screw and clearance drill is provided that in one mode of operation is able to drill a pilot hole for the screw threads through a top piece of material and then screw into a lower piece of material, thus enabling the two pieces of material t... | 06/02/1998 |
| 5725581 | Anchoring element supporting prostheses or a joint mechanism for a reconstructed joint An anchoring element (1) for supporting prostheses or part thereof. The anchoring element (1) is substantially rotationally symmetrical and provided with external threads (20) and a central bore (2). At least one slit (3, 4, 5, 6) is arranged in spiral fo... | 03/10/1998 |
| 5702445 | Anchoring element for implantation in tissue, for holding prosthesis, artificial joint components or the like An anchoring element for implantation in bone or other tissue takes the form of an externally threaded screw, for example of titanium or other tissue compatible material. Such an anchoring element may be used, for example for holding prostheses or artific... | 12/30/1997 |
| 5702443 | Anchoring element for implantation in tissue, for holding prostheses, artificial joint components or the like An anchoring element for implantation in bone or other tissue takes the form of an externally threaded screw, for example of titanium or other tissue compatible material. Such an anchoring element may be used, for example for holding prostheses or artific... | 12/30/1997 |
| 5395195 | Thread-forming screw with tri-roundular, tapered end A thread-forming screw includes a tapered end portion having a tri-roundular cross section with three spaced flats and three threaded, round portions disposed in an alternating manner about the screw's periphery. The screw is formed by inserting a tapered... | 03/07/1995 |
| 5242253 | Thread-forming screw A thread-forming screw includes a tapered end portion formed by inserting a cylindrical blank between paired dies each having a straight portion and a tapered portion. The threads of each die are provided with undulations along their lengths corresponding... | 09/07/1993 |
| 5234291 | Roof bolts The roof bolt tendon comprises a length of square twist steel with a partial thread formed directly thereon over at least part of its length. The partial thread, which may extend for the full length of the tendon and which is preferably formed by rolling,... | 08/10/1993 |
| 5110245 | Thread forming screw This invention relates to an improvement of a thread forming screw including driven head, cylindrically formed shanks rolled type thread which has a following flank angle smaller than a progresssive flank angle and is interrupted by plural slot recesses l... | 05/05/1992 |
| 5061132 | Self-locking fastener A self-locking fastener system comprises a pin for receipt in a hole in a workpiece and having an external thread which mates with a collar having an internal thread for carrying a tensile load. A plurality of helically extending flutes in the external th... | 10/29/1991 |
| 4856952 | Deformed bar for adhesion and applying tension A rock-bolt bar having raised deformation its entire length and having an end portion threaded to receive a standard helically threaded nut. The raised deformations are all raised to the same height above a minor diameter of the bar and the depths of the ... | 08/15/1989 |
| 4815909 | Wood screw and method for making same A wood screw has a resilient shaft carrying a spiral thread of nominal pitch from the tip. The thread is interrupted at a plurality of intervals and the shaft is torsionally resilient. When the screw fastener is driven, the shaft twists and contracts so t... | 03/28/1989 |
| 4718802 | Sawtooth-profile nail A plasterboard, boat, flooring underlayment or like ridged nail is provided with a taper of its sawtooth profile toward the point of the nail. The crests of the ridges can lie along one imaginary cone converging toward the point while the roots of the rid... | 01/12/1988 |
| 4697969 | Wood screw An improved wood screw which is self drilling. The wood screw has a first spiral flute that extends essentially the full length of the screw. The screw also has a second spiral flute which begins at the point of the screw and which terminates a short dist... | 10/06/1987 |
| 4583898 | Drill screw and cutters for making same A self-drilling and self-tapping screw with a compound flute configuration having a straight portion including at least part of the cutting edge and a curved portion defining the drag surface. Generally convex point configurations having uniformly radiuse... | 04/22/1986 |
| 4479748 | Screw-and-nut unit or screw joint The invention is a screw and nut assembly having a particular thread configuration. The externally threaded spindle has both a spiral threaded portion and a spiral non-threaded portion which separates the convolutions of the threaded portion. The threaded... | 10/30/1984 |
| 4395173 | Drill screw with protective burrs A drill screw having protective burrs on the cutting edges. These burrs preserve the sharpness of the cutting edges against heavy plating buildup which can have detrimental effects on performance. Further, whereas conventional burrs on the drag surfaces c... | 07/26/1983 |
