Henry Alcock, England, 1880-1910, "Manhattan".
Johnson Bros, England, 1902, "Clayton".  Thanks Antique Trader for helping me ID it!!  Pat has no manufacture mark.  Just the fish looking spot, and an impressed letter where the arrow is pointing.
French China Co, Sebring, Ohio, 1916-1929.  Personally I chuckle when I see this pat on ebay when the price is up to $20 for just one.  Lowest quality of Flow Blue out there.  Typically lots of crazing and discoloration.
Alfred Meaking (Ltd), Tunstall, England, c. 1891-1930, "Kelvin".  There are an abundant amount of marks which I have not seen on this particular pat before.  I guess that makes up for the not so excellent condition.  Of course the Meaking mark, impressed circle (workmens mark), impressed fleur de lis, and blue F. 
Royal Bayreuth, Germany, 1887-1902.
John Maddock & Sons Ltd, England, 1891+,"Heumann".
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