Just a another comment .
The original screend bottom Boards has been in my use since May or June
1999 and the second version immediately after Apimondia in Vancouver
BC / Ca in Sept 99. Prior to these dates another design for the same
purpose is / was explained at a French web site . According to other
reliable sources reports the use of and the results of the use were 5
years in the making prior to 1999. Another source found on the internet
tells of Danish beekeepers having used this idea since 40 years .
Insofar the Britsh design , called "open mesh floor" is in action I am
not aware of.
I do not appreciate anyone to seek the credit for something which
she/he had no part in designing and having the gull to try to patent an by
now ancient idea. But then again ; It's not my money spent for nothing.
In any case these boards certainly have their use and advantages over and
above the detrimental influence of varroa propagation.
Jdf