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The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
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| Number | Title | Issue Date |
| 6775872 | Surface-traversing vehicle A vehicle for traversing a surface such as for carrying out an inspection, survey or maintenance operation upon that surface comprises two bodies interconnected by means to move the bodies towards and away from each other, each of those bodies being supported upon a... | 08/17/2004 |
| 5966768 | Adjustable tube-cleaner device Adjustable tube-cleaning device (10) has a scraper sub-assembly (16) which includes a substantially annular sleeve (32) on a circumferential outer surface (30) of an elastic core (14) which, in turn, is mounted on a central shaft (12). The sleeve (32) con... | 10/19/1999 |
| 5797993 | Expandable pipeline pig assembly The invention is an expandable pipeline pig for separating different liquids and gases in a flexible oil/gas export riser feeding to a larger diameter rigid oil/gas export pipeline. The invention includes a cylindrical body member; a front plate member, a... | 08/25/1998 |
| 5000260 | Casing scraper A casing scraper is provided for scraping foreign materials from the inside of pipe casing and other tubular members. The casing scraper is comprised of a central mandrel supporting a plurality of longitudinally and circumferentially extending scraper bla... | 03/19/1991 |
| 4846895 | Remotely operated rotary tube cleaning system and method A rotary tube cleaning system having a rotary cutting tool attached to an elongated flexible drive wire for remotely cleaning the inside of elongated tubes, and method for its use. The tube cleaning system includes a special rotary cutting tool rigidly at... | 07/11/1989 |
| 4031590 | Pipe scraper Apparatus for scraping the interior sides of the walls of pipes, having retractable scraper elements at each end of a carrier body or at only one end thereof. The scraper apparatus is preferably moved in both directions through a pipe, the trailing scrape... | 06/28/1977 |
| 3977331 | Pipe scraper Apparatus for scraping the interior sides of the walls of pipes, having ractable scraper elements at each end of a carrier body. The scraper apparatus is preferably moved in both directions through a pipe, the trailing scraper elements preferably being r... | 08/31/1976 |
