Context: The first British patent for the use of asphalt/bitumen was 'Cassell's patent asphalte or bitumen' in 1834. Then on 25 November 1837, Richard Tappin Claridge patented the use of Seyssel asphalt (patent #7849), for use in asphalte pavement, having seen it employed in France and Belgium when visiting with Frederick Walter Simms, who worked with him on the introduction of asphalt to Britain. Dr T. Lamb Phipson writes that his father, Samuel Ryland Phipson, a friend of Claridge, was also "instrumental in introducing the asphalte pavement (in 1836)". Indeed, mastic pavements had been previously employed at Vauxhall by a competitor of Claridge, but without success.

Question: When was the first British patent for the use of bitumen?
Answer: 1834

Question: When did Richard Tappin Claridge patent asphalt for use in pavement?
Answer: 25 November 1837

Question: Where had Claridge previously seen asphalt used as pavement?
Answer: France and Belgium

Question: What type of pavement techniques had already been tried by a competitor of Claridge?
Answer: mastic

Question: What friend of Claridge's was helpful in introducing asphalt for use in pavements?
Answer: Samuel Ryland Phipson

Question: In what year was Cassell's patent France or Belgium issued?
Answer: Unanswerable

Question: The second patent, Cassell's patent, was issued in which year?
Answer: Unanswerable

Question: On what day did Claridge's patent #5309 patent the use of Seyssel asphalt? 
Answer: Unanswerable

Question: In 1845 Richard Tappin Claridge patented the use of what?
Answer: Unanswerable

Question: When was the second British patent for using bitumen issued?
Answer: Unanswerable