a more detailed explanation of the difference between the product produced by plaintiffs and defendants' competing filter.


6
Defendant Taylor, after his graduation from Ohio State University in industrial engineering, spent his lifetime working with, manufacturing and developing fiber glass products, particularly in the field of filtration, first with Owens Corning, next with Vibradamp Corporation, and, since 1953, as President and principal stockholder of defendant Enfab, Inc., which he organized to manufacture fiber glass doughnuts for a Government rocket program. In 1956, Enfab became a supplier to Bowser, Inc. of B fiber, fiber glass doughnuts, and in 1958, a supplier to Briggs of 8 pound density, two-inch fiber glass doughnuts, with specified dimensions and grooved interior for use in manufacture by plaintiff of its water separator cartridge under the Marvelpatent.


7
Beginning in late 1954 Enfab worked with Oliver United Filters (later Dorr Oliver) in the design and production of fiber glass wrapped tubes for use in filtration, some of multilayer construction, and early in 1958, worked with Permanent Filter Corporation in the design and production of a filter-separator cartridge of multifiber wrapped tube design.


8
In August, 1957, Enfab, under Taylor's management, in an effort to expand Enfab sales to filtration companies, sent out mailings to various companies suggesting the possibilities of a tube with dual diameter fiber glass wraps, and in September, 1957, Taylor visited Briggs Filtration with rough samples of what he had in mind. At that time, Briggs ordered samples for testing of a convolute type tube, specifying coarse fiber on the inside layer and finer fiber