In November 1865 Franklin had attempted to obtain a license for the Rollin White patent from competitor Smith & Wesson. White and Smith & Wesson would earn no less than $1.1 million, but the directors of Franklin and Colt decided it was too large an investment in a patent that would expire in 1868.  In the meantime, Colt has turned to manufacturing products other than firearms, such as watches, sewing machines, typewriters and bicycles.   In 1868, Rollin White applied for an extension of his patent, but the application was denied. He then addressed Congress, but the request was again rejected, this time by the Senate and on the initiative of President Ulysses Grant in January 1870 . This led to the patent being extinguished, allowing competing weapons to develop their own rear-magazine pistols and metal cartridges. In the same year 1870, Colt`s purchased the National Arms Company, a brooklyn, New York company known for making derringers and for circumventing the Rollin White patent by using a single cartridge. Colt continued to produce the .41 Short Derringer after the acquisition to enter the metal cartridge gun market, but also introduced its three own Colt Derringer models, all also housed in a single .41 Rimfire cartridge. The last model in production, the third Colt Derringer, was not discontinued until 1912.  The first metal magazine weapons sold by Colt`s were the Derringers, designed by the National Arms Company in 1870, but Colt`s also began to develop its own rear magazine and cartridge guns.
Negotiations between Colt and the military lasted until 1997. An agreement was reached in December 1997. Colt would waive its claims for compensation and leave intact the terms of the 1967 license agreement for the M16 TDP. In exchange, the military agreed not to use the M4 TDP for a set period of time for competitive purchases to ensure single-source status for colts. The resulting agreement was called the “M4 Addendum”. 2) Payment. Optional paid services, such as educational courses, are available on the Site (“Services”). By choosing a service, you agree to pay COLT the fees indicated for that service. Payments are calculated in advance on the day you register for a service and cover the use of that service for a specified period of time, as indicated. Service fees are non-refundable. By purchasing services on the Site, you agree to be solely responsible for understanding the terms of renewal of your license or authorization issued by the state and for ensuring that you purchase the right courses. By offering services, COLT does not guarantee that your purchases meet the requirements for renewing your license or government-issued authorization.
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