Virgin Mobile USA

 Virgin Mobile USA was a no-contract Mobile Network Operator. It used Sprint's network for coverage. It qualified the Virgin Mobile brand from United Kingdom-based Virgin Group. Virgin Mobile USA was headquartered in Kansas City, Missouri, and provided service to approximately 6 million customers.[2][3] Founded in 2001 as a jv between Virgin Group and Sprint Corporation, Virgin Mobile USA commenced functions in June 2002 as a mobile virtual network operator (MVNO), providing services via the Sprint 1900 MHz CDMA network. In '09 2009, Sprint Nextel bought out joint-venture partner Virgin Group, becoming the only real owner of Virgin Mobile USA. In June 2017, Virgin Mobile dropped all Android and commenced to only offer iPhones to clients under its new "Inner Circle" unlimited plan. Following a discontinuation of the program in 2018, it started out to revive Android devices to its lineup. In January 2020, Virgin Mobile announced that it could turn off, and transfer its

History and Physical Properties of Polyethylene terephthalate 2021

 History PET was patented in 1941 by John Rex Whinfield, James Tennant Dickson and their employer the Calico Printers' Association of Manchester, England. E. I. DuPont de Nemours in Delaware, USA, first used the trademark Mylar in June 1951 and received registration of it in 1952.[11] It really is still the best-known name used for polyester film. The existing owner of the trademark is DuPont Teijin Films US, a partnership with a Japanese company.[12] In the Soviet Union, PET was initially made in the laboratories of the Institute of High-Molecular Compounds of the USSR Academy of Sciences in 1949, and its own name "Lavsan" means thereof (лаборатории Института высокомолекулярных соединений Академии наук СССР).[13] YOUR PET bottle was patented in 1973 by Nathaniel Wyeth.[14] Physical properties Sailcloth is typically created from PET fibers generally known as polyester or beneath the brand Dacron; colorful lightweight spinnakers are generally made of nylon. PET in its natu