John E Krewalk

US Patent:

7618330, Nov 17, 2009

Filed:

Sep 21, 2007

Appl. No.:

11/859056

Inventors:

John Joseph Krewalk - Bloomfield CT, US
Michael Malerba - Manchester CT, US

International Classification:

A63B 53/04

US Classification:

473328, 473350

Abstract:

Disclosed herein is a golf club, comprising a shaft and a golf club head disposed at one end of the shaft. The golf club head has a face on a front of the golf club head, a cavity surface on a back of the golf club head, and a bottom flange extending from a bottom edge of the face to a bottom edge of the cavity. The bottom flange has a plurality of grooved channels extending across a width of the bottom flange of the golf club head, such that the golf club head provides a flow path, permitting a medium to flow through the grooved channels, thereby reducing resistance to motion of the golf club head during play.

US Patent:

20070142120, Jun 21, 2007

Filed:

Dec 20, 2005

Appl. No.:

11/311710

Inventors:

John Krewalk - Bloomfield CT, US
Michael Malerba - Manchester CT, US

International Classification:

A63B 53/00

US Classification:

473328000

Abstract:

Disclosed herein is a golf club, comprising a shaft and a golf club head disposed at one end of the shaft. The gold club head has a face on a front of the golf club head, a cavity surface on a back of the golf club head, and a bottom flange extending from a bottom edge of the face to a bottom edge of the cavity. The bottom flange has a plurality of grooved channels extending across a width of the bottom flange of the golf club head, such that, the golf club head provides a flow path, permitting a medium to flow through the grooved channels, thereby reducing resistance to motion of the golf club head during play.

US Patent:

40632636, Dec 13, 1977

Filed:

Apr 15, 1976

Appl. No.:

5/677269

Inventors:

John J. Krewalk - West Hartford CT

Assignee:

Criterion Manufacturing Company, Inc. - West Hartford CT

International Classification:

G03B 926
G02B 702
G02B 522

US Classification:

354253

Abstract:

A manually operated shutter attachment includes a pair of plate members each having an aperture therethrough secured in spaced parallel relationship with the apertures aligned. A blade member having a body portion and handle portion is pivotably mounted intermediate the plate members with the handle portion extending outwardly of the spacing therebetween whereby the body portion may be pivoted into and out of registration with the aligned apertures in the plate members by manual manipulation of the handle portion. Mounting means are provided on the outer surfaces of both plate members and extend about the apertures thereof for mounting the shutter attachment intermediate a telescope and camera and/or for securing a plurality of similar shutter attachments together. The body portion of the blade member may be opaque to provide a shutter or incorporate an optical filter or lens.

US Patent:

39321487, Jan 13, 1976

Filed:

Jan 21, 1975

Appl. No.:

5/542725

Inventors:

John J. Krewalk - West Hartford CT

Assignee:

Criterion Manufacturing Company, Inc. - West Hartford CT

International Classification:

B24B 100
B24B 1300

US Classification:

51284R

Abstract:

Complex aspheric optical surfaces may be made reliably and relatively rapidly by a method in which one surface of a relatively thick glass block is ground and polished to the desired aspheric surface, which may be tested in a system including master optics of the remaining components. This master die block may then be used to generate reverse die plates by drawing thin glass blanks against the configured surface thereof and polishing to an optical flat. These reverse die plates are then mounted on a base die block and deformable glass blanks are drawn against the configured surface thereof and the opposite surface polished to an optical flat. Upon removal, the glass blanks assume a curvature identical to the original aspheric surface of the master die block.