SAFA Skysailor Magazine

33 November | December 2022 SKY SAILOR 29 May 1947: Robert F. Bach filed Patent Application US2463135. 17 September 1947: Allison’s first model of [later] patented kite flown. 29 January 1948: George D. Wanner filed Patent Application US2537560. July 1948: Allison makes firsts drawings for patent US2737360. 15 August 1948: Gertrude S. and Francis M. Rogallo created concept for their flexible kite and started experimenting. 23 November 1948: Rogallos filed Patent Application US2546078. 1 March 1949: Bach US2463135 approved. 21 September 1949: Rogallos Application for US2546078 is rejected. 7 January 1950: Allison’s first written description for Patent US2737360. 14 March 1950: Rogallos filed Amendment for Patent Application US2546078. NH Summer 1950: Rogallos first flights of kite in Patent US2751172. 29 August 1950: Rogallos amendment for US2546078 is allowed. 8 September 1950: Allison filed Patent Application US2737360. 9 January 1951: Wanner US2537560 approved. 20 March 1951: Rogallos US2546078 approved. 15 August 1952: Rogallos first disclosure to others of Patent US2751172. 30 August 1952: Rogallos first drawings of Patent US2751172. 17 November 1952: Rogallos filed Patent Application US2751172. 31 July 1953: Rogallos Patent Application US2751172 rejected. 11 January 1954: Rogallos filed Amendment for Patent Application US2751172. 11 March 1954: Rogallos Patent Application US2751172 final rejection. 3 May 1954: Rogallos filed Amendment for Patent Application US2751172. 14 June 1954: Rogallos Patent Application US2751172 Decision. 6 July 1954: Allison – Interference. Preliminary Statement. 14 September 1954: Allison – Interference, request for clarity about reduction to practice. 22 September 1954: Allison – Interference, Amended Preliminary Statement. 31 May 1955: Rogallos – Interference, Concession of Priority. 3 June 1955: Rogallos – Interference, adverse finding. 13 June 1955: Rogallos Patent Application US2751172 rejected. 20 November 1955: Rogallos filed Amendment for Patent Application US2751172. 6 March 1956: Allison US2737360 approved. 19 June 1956: Rogallos US2751172 approved. The first Flexible Kite was Allison’s. For more, contact Graeme via email . ‘Patent pending’, but eventually rejected Rogallo’s Flexikite Photo: Mark Woodhams