--and not to grind or crush--corn, wheat,
or coffee. These were subsequently incorporated in the Ideal steel-cut
coffee mill and marketed to the trade by the B.F. Gump Co., Chicago.

In 1917, Richard A. Greene and William G. Burns, assignors to Jabez
Burns & Sons, New York, were granted patents in the United States on
the Burns flexible-arm cooler (for roasted batches) providing full
fan-suction to a cooler box at all points in its track travel.

In 1919, Joseph F. Smart, assignor to Landers, Frary & Clark, New
Britain, Conn., was granted a United States patent on a percolator.

In 1919, Charles Morgan, assignor to the Arcade Manufacturing Co.,
Freeport, Ill., was granted a United States patent on an improved
grinding mill.

In 1919, Edward F. Schnuck, assignor to Jabez Burns & Sons, New York,
was granted a United States patent on an improvement for a gas coffee
roaster. In 1920, he was granted a United States patent on an improved
process of twice cutting coffee and removing the chaff after each
cutting.

In 1920, Natale de Mattei, of Turin, Italy, was granted a United States
patent on a rapid coffee-filtering machine.

In 1920, Frederick H. Muller, of Chicago, was granted a United States
patent on "an art of making coffee," and on an improved apparatus for
hotels and restaurants, which comprised a series of superposed metal
containers, or cartridges, of ground coffee placed in a perforated
bucket designed to rest in a coffee urn, the cartridges being lifted out
as the boiling water poured on them sinks with the drawing off of the
"decoction" at the faucet.

[Illustration: THE N.C.R.A. HOME COFFEE MILL]

[Illustration: THE MANTHEY-ZORN RAPID COFFEE INFUSER AND DISPENSER]

In 1920, Alfredo M. Salazar, of New York, was granted a United States
patent on a coffee urn in which the coffee is made at the time of
serving by using steam pressure to force the boiling water through
ground coffee held in a cloth sack attached to the faucet.

In 1920, William H. Bruning, Evansville, Ind., was granted a United
States patent on an improved French drip pot made of aluminum and
provided with a vacuum jacket in the dripper section, and a hot-water
jacket in the serving portion, to keep the beverage hot.

In 1921, the Manthey-Zorn Laboratories Co., of Cleveland, brought out a
rapid coffee-infuser and dispenser employing in the infuser a
centrifugal to make an extract in thirty-eight seconds, and designed to
deliver a gallon