the stratapore technology is patented by donaldson
StrataPore™ Filtration Media
Most filters look the same on the outside. It's what's inside that counts. Fleetguard® exclusively designed StrataPore™ synthetic media in our Media Center for optimum performance and longer life. Unlike cellulose and microglass media, StrataPore™ is multi-layered, with an optimum number of layers for the desired level of particle removal.
That is from Fleetguards website.
Looks pretty clear to me.
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