Although Brewster patented kaleidoscope in 1817 ( GB 4136 ), a copy of the prototype was shown to London opticians and copied before the patent was granted.

Although a Dutch spectacle maker created the compound lens and inserted it in a microscope around the turn of the seventeenth century, and Galileo had applied the principle of the compound lens to the making of his microscope patented in 1609, its possibilities as a microscope had remained unexploited for half a century, until Robert Hooke improved the instrument.

Although Whitney patented his own design for a cotton gin, he manufactured a prior design from Henry Odgen Holmes, for which Holmes filed a patent in 1796.

Although the first design was patented as early as 1908, the first commercial 35 mm camera was the 1913 Tourist Multiple, for movie and still photography, soon followed by the Simplex providing selection between full and half frame format.

Although simple handheld roller gins have been used since at least 500 AD, the first modern mechanical cotton gin was created by American inventor Eli Whitney in 1793, and patented in 1794.

Although antifuse OTP has been available for decades, it wasn ’ t available in standard CMOS until 2001 when Kilopass Technology Inc. patented 1T, 2T, and 3. 5T antifuse bit cell technologies using a standard CMOS process, enabling integration of PROM into logic CMOS chips.

Although functional and practical, Fay's design along with the 50 other designs patented prior to 1899 are not considered reminiscent of the modern paperclip design known today.

Although Boulton had described and patented ailerons in 1868, no one had actually built them until Esnault-Pelterie ’ s glider, almost 40 years later.

Although Twister was patented by Charles F. Foley and Neil Rabens, sources also mention a man by the name of Reyn Guyer.

Although most modern copyright systems do not treat copyrighted or patented materials in the same way as real property, the term " intellectual property " has gained prominence.

Although several theoretical uses for EMPTA were postulated as well as several patented processes using EMPTA, such as the manufacture of plastic, no known industrial uses of EMPTA were ever documented nor any products that contained EMPTA.

Although the McCormick reaper was a revolutionary innovation for the harvesting of crops, it did not experience mainstream success and acceptance until at least 20 years after it was patented by Cyrus McCormick.

Although a crystallisation process using strontium hydroxide was patented by Augustin-Pierre Dubrunfaut in 1849 the large scale introduction came with the improvement of the process in the early 1870s.

Although Camellia is patented, it is available under a royalty-free license.

Although preservation of food using tin cans had been practiced since at least 1772 in the Netherlands, the first can openers were patented only in 1855 in England and in 1858 in the United States.

Although tanning beds were initially brought to America by Friedrich Wolff in 1979 he soon patented his particular blend of phosphors ( since expired ) and began licensing the technology to other companies.

Although it could be regarded as having its distant origins in the escapement invented by Robert Robin, C. 1792, which gives a single impulse in one direction, the design of the Daniels Co-Axial is more akin that of another Robin variant, the Fasoldt escapement which was invented and patented by the American Charles Fasoldt in 1859.

Although the Aztec code is patented,

Although a square-socket drive had been conceived decades before ( having been patented in 1875 by one Allan Cummings of New York City, ), it had never been developed into a commercial success, and Robertson's efficient manufacturing technique using cold forming for the screw's head is what made the idea a commercial success.

Although complex, this process was simpler and more efficient than other processes then in some limited use, and in 1884 Ives asserted that it was " the first patented or published process which was introduced into truly successful commercial operation.

Although many patterns and forms of amalgamating pans were invented and patented, there was much room for improvement.

Although the invention was patented in 1937, Finisterre had to escape to France after the fascist coup d ' état, and he lost the patent papers in a storm.

Although paper matches were patented in the 1880s, an early paper match " folder " was patented in September 1892 by Philadelphia patent attorney Joshua Pusey, however the matchbook as we know it was patented a few weeks later by Charles Bowman of Lebanon, PA. Pusey challenged Bowman's patent, but Bowman's patent was upheld.

Although, in these early years, engines came in a number of configurations, typically Q < sub > H </ sub > was supplied by a boiler, wherein water was boiled over a furnace ; Q < sub > C </ sub > was typically a stream of cold flowing water in the form of a condenser located on a separate part of the engine.

Although the concept was proven sound and the 500 megawatt engine finished a successful test run in 1961, no airworthy device was ever completed.

Although Babbage's design was technically feasible, no one had built a mechanical device to such exacting standards before, so the engine proved to be much more expensive than anticipated.

Although unsuccessful, he made a two-stroke toy engine in 1919, called Des Knaben Wunsch —" the boy's desire ".

Although the engine produces just 92 millinewtons ( 0. 331 ounce-force ) thrust at maximum power ( 2, 100W on DS1 ), the craft achieved high speeds because ion engines thrust continuously for long periods.

Although listed under the general heading of " panoramas " in the sales catalogues of the time, those films shot straight forward from in front of a railway engine were usually specifically referred to as " phantom rides ".

Although K-Meleon 0. 9. 13 is based on Gecko 1. 7. 13, which is now obsolete, a simulation of it ( called " K-Meleon0. 9. 13-ud3-1. 8. 0. 7 ") has been made that is based on a current " k-meleon. exe " and a recent 1. 8. 0. x Gecko rendering engine to allow people who prefer the older K-Meleon 0. 9 interface to update their browsing to current security standards.

Although MATLAB is intended primarily for numerical computing, an optional toolbox uses the MuPAD symbolic engine, allowing access to symbolic computing capabilities.

Although compact, for use in a cramped submarine, this design of engine was not repeated.

Although the reciprocating steam engine is no longer in widespread commercial use, various companies are exploring or exploiting the potential of the engine as an alternative to internal combustion engines.

Although this is a relatively fast movement, perhaps a second or so while transmission is in neutral, it allows the engine speed to drop and synchronize engine and transmission revolutions relative to the road speed.

Although it is relatively easy to derive a 90 ° V6 from an existing V8 design by simply cutting two cylinders off the engine, this tends to make it wider and more vibration-prone than a 60 ° V6.

Although many manufacturers licensed the design, including Citroën with their M35 and GS Birotor, using engines produced by Comotor, General Motors, which seems to have concluded that the Wankel engine was slightly more expensive to build than an equivalent reciprocating engine, although claiming having solved the fuel economy issue, but failed in obtaining acceptable exhaust emissions, and Mercedes-Benz which used it for their C111 concept car, only Mazda has produced Wankel engines in large numbers.

Although in two dimensions the seal system of a Wankel looks to be even simpler than that of a corresponding multi-cylinder piston engine, in three dimensions the opposite is true.

Although engineering studies of all of these designs were made, only the solid-core engine was ever built.

Although he designed a basic form of internal combustion engine, fueled by gunpowder, he never successfully built one.

Although he also developed a type of rotary aircraft engine, he did not create and fly a powered fixed-wing aircraft.

Although it was the popularity of the Oldsmobile division vehicles that prompted this change, declining sales of V8 engines would have made this change inevitable as all but the Chevrolet version of the 350-cubic-inch engine were eventually dropped.

Although it was only fractionally longer than the contemporary Volkswagen Beetle, Time said the length of its hood over the front-mounted engine made " the difference seem considerably more ", adding that the car " resembles a sawed-off station wagon, with a long, low hood and swept-up rear, and is faintly reminiscent of the original Studebaker Avanti.

Although it was to be several years before Bristol showed any profit from the aero engine division, the Jupiter engine eventually proved enormously successful: indeed, during the inter-war period the aero-engine division was more successful than the parent company and Bristol came to dominate the market for air-cooled radial engines.

Although a small car, the engine has great elasticity and gave the feeling of better output than its small nominal size.