US2660436A - Indicating disk for golf club heads - Google Patents

Indicating disk for golf club heads Download PDF

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Publication number
US2660436A
US2660436A US170180A US17018050A US2660436A US 2660436 A US2660436 A US 2660436A US 170180 A US170180 A US 170180A US 17018050 A US17018050 A US 17018050A US 2660436 A US2660436 A US 2660436A
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Prior art keywords
face
member
club
golf club
disc
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Expired - Lifetime
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US170180A
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Eugene F Grossman
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Eugene F Grossman
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    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B69/00Training appliances or apparatus for special sports
    • A63B69/36Training appliances or apparatus for special sports for golf
    • A63B69/3611Training appliances or apparatus for special sports for golf not used, see A63B69/36 and subgroups
    • A63B69/3617Striking surfaces with impact indicating means, e.g. markers

Description

Nov. 24, 1953 E. F. GROSSMAN 60,436

INDICATING DISK FOR GOLF CLUB HEAD Filed June 24, 1950 EUGENE r: GkQS'SMflM INVENTOR.

BY i yad-fwb Patented Nov. 24, 1953 UNITED STATES PATENT OFFICE INDICATING DISK FOR GOLF CLUB HEADS Eugene F. Grossman, Santa Monica, Calif.

Application June 24, 1950, Serial No. 170,180-

3 Claims.

This invention relates to improvements in golf clubs for permitting the location of impact between the club and a golf ball, and this invention also relates to a golf playing aid or member which can be applied to the face of the golf club for recording the location of impact between the club and ball.

A main object of the present invention is to provide an improved golf club which is provided with a member superimposed on the face of the club for recording the location of impact between the club and a golf ball.

Another object of the present invention is to provide a member which can be applied to the face of the golf club for recording the location of impact between the club and ball.

Another object of the present invention is to provide a member as set out above provided with means for removably securing the member to the face of the club.

Another object of the present invention is to provide a member as above described marked and constructed to enable the location of the impact between the club and the ball to be more readily and quickly observed.

Another object of the present invention is to provide a member as above described, which is provided with means to enable it to be centered on the face of the golf club.

With the foregoing and other objects in view, which will be made manifest in the following detailed description and specifically pointed out in the appended claims, reference is had to the accompanying drawing for an illustrative embodiment of the invention, wherein:

Figure 1 is a three-dimensional view of a golf club embodying the concepts of the present invention shown in position for striking a golf ball;

Fig. 2 is a front view in elevation of the golf club shown in Fig. 1;

Fig. 3 is an enlarged fragmentary sectional view along lines 3-3 of Fig. 2, showing the location recording member and its manner of application to the face of the club;

Fig. 4 shows a modified form of the location recording member;

Fig. 5 is an enlarged fragmentary section view along lines 55 of Fig. 4;

Fig. 6 is another modified form of the invention shown in three dimensions; and

Fig. 7 is an enlarged fragmentary sectional view along lines l'! of Fig. 6.

Referring to the accompanying drawings wherein similar reference characters designate similar parts throughout, Figure 1 shows a golf club generally indicated at IU which happens to be a driver but could as well be an iron. The golf club In has a face II and on this face there is removably secured a location recording member l3 in centered relation with respect to the face H. Member [3 has a central aperture l4 adapted to be aligned with a centering mark or indentation It on the face of the club.

The member l3 comprises a laminated structure including a layer 20 of colored sheet material and may conveniently take the form of colored cellophane, this layer 20 having a tacky adhesive 2| on the back thereof to enable the member 13 to be readily secured to the face of the golf club and yet be readily removed from the face of the golf club without coating the face. The outer side of layer 20 has a thin coating of wax 24 provided thereon. When the ball 26 contacts the member I3 a portion of the wax at 28 which may be considered the point of impact, is removed by the ball thereby exposing the colored surface of layer 20. This action clearly locates with reference to the center [4 of the member l3 the point of impact of the ball 26 on the face of the club.

The member 13 is preferably marked with radial lines 30 which assist the user of the club in more definitely locating the point of impact between the ball and the face of the club. The layer 20 of colored material preferably comprises three concentric rings of different colors. For instance, an outer ring of green 3|, an intermediate ring 32 of blue, and a central ring 33 of red. The wax 24, on the face of layer 20 does notcompletely obscure the lines 30 or the concentric rings 3|; 32, and 33, the wax giving a sort of translucent but not transparent effect. It is contemplated, however, that the layer 24 could be of material to completely obscure the markings on the member I3 and also completely obscure the fact that the member 13 was made of concentric different colored rings. The only difference would be that the user of the club would not be aware of the location of the rings and lines until after he had struck the ball but this difference would be rather immaterial. By providing the concentric different colored rings and the radial lines 30, an automatic indication of the degree of accuracy is recorded by the member l3 so that after the member 13 has been struck the user of the club merely peels off the member l3 and views where the member [3 has recorded the point of impact between the club and the ball. In Fig. 3, the user would observe a blue spot on the member l3 and therefore realize that the ball had not struck the face of the club centrally thereof whereas, if a spot of red was exposed, then the user would be apprised of the fact that the ball had struck the face of the club substantially centrally thereof. It will be appreciated that between the concentric rings 3|, 32, and 33 and radial lines 30 that information is also given with regard to hooks and slices thereby enabling the user to improve his game.

A modified form of the invention is disclosed in Figs. 4 and 5 wherein there is a laminated member generally indicated at 40 comprising a sheet 4| of carbon paper having the marking face 42 facing outwardly and the rear surface thereof having tacky adhesive 44 applied thereto to enable the member 40 to be readily applied to and re moved from the face of a golf club. In this modification of the invention it is contemplated that a sheet of translucent material 45 will be applied to the outer face of the carbon sheet 4|. When the ball strikes the member 40 an imprint will be recorded by the sheet 45. The user will be able to observe the location of the imprint with regard to the center of the member 40 and therefore be ap prised of the accuracy of contact of the golf ball with the face of the club.

Figs. 5 and 6 show still another modified form of the invention which comprises a laminated structure generally indicated by the reference numeral 50 which includes an intermediate layer 5| of carbon paper or the like having the marking face 52 facing outwardly and having the rear face thereof coated with a tacky adhesive 54. There is an annular ring of adhesive 56 around the peripheral outer face of sheet 5| to enable an opaque sheet 51 to be temporarily applied thereto. In this form of the invention it is contemplated that the entire member 50 may be removed from the face of the golf club and the outer sheet 51 removed to view the imprint made on the member 51 upon contact of the ball therewith, or, the member 50 may be left on the face of the golf club and the sheet 51 peeled off and either member 5'! replaced by another member or the marked sheet being merely pressed back into place.

It will be appreciated that the present invention provides a member which records the location of impact between the club and the ball and which member is readily applicable to the face of a golf club and readily removable therefrom. The representations in the drawing have been of necessity enlarged for a clearer presentation but it will be realized that the location recording members are very thin and therefore do not interfere with the usual contact between the golf 4 ball and the face of the club. There will be unavcidably a slight shock-absorbing feature provided by the location recording member, but this will be very slight and will not in any way materially interfere with the normal effective use of a golf club.

Various changes" may be made in the details of construction without departing from the spirit and scope of the invention as defined by the appended claims.

I claim:

1. A golf playing aid comprising a disc of colored material, a tacky adhesive on one face of said disc for attaching the disc to the striking face of a golf club, and a readily removable waxy layer on the face of said disc opposed to said one face whereby when a golf ball is struck by the disc in the course of swinging a golf club on which the disc is mounted a portion of said waxy layer will be removed thereby.

2. A golf playing aid comprising a disc of colored material, a tacky adhesive on one face of said disc for attaching the disc to the striking face of a golf club, an aperture in said disc for aligning the latter with the center of said club, and a readily removable waxy layer on the face of said disc opposed to said one face whereby when a golf ball is struck by the disc in the course of swinging a golf club on which the disc is mounted a portion of said waxy layer will be removed thereby.

3. A golf playing aid comprising a disc of colcred material, a tacky adhesive in one face of said disc for attaching the disc to the striking face of a golf club, radial lines and concentric circles imprinted on said disc in opposed relationship to said one face for dividing the disc into areas, and a readily removable waxy layer on the face of said disc opposed to said one face whereby when a golf ball is struck by the disc in the course of swinging a golf club on which the disc is mounted a portion of said waxy layer will be removed thereby.

EUGENE F. GROSSMAN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 566,101 Sweny Aug. 18, 1896 1,464,029 Coughtrie Aug. '7, 1923 1,485,089 Musselman Feb. 26, 1924 2,030,135 Carpenter Feb. 11, 1936 2,495,679 Abrecht et al Jan. 31, 1950

US170180A 1950-06-24 1950-06-24 Indicating disk for golf club heads Expired - Lifetime US2660436A (en)

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Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071379A (en) * 1959-07-20 1963-01-01 Joseph A Canfield Device for checking golf swing
US3081091A (en) * 1962-03-08 1963-03-12 Craig H Grow Practice ball
US3088321A (en) * 1960-05-12 1963-05-07 Lathrop John Douglas Head speed indicator for golf clubs
US3137507A (en) * 1961-09-14 1964-06-16 David A Pickler Golf practice device and method
US3437341A (en) * 1967-01-04 1969-04-08 Gen Standard Co Practice golf club
US3516675A (en) * 1966-05-13 1970-06-23 Brunswick Corp Golf game apparatus
US3754764A (en) * 1972-04-27 1973-08-28 F Manheck Golf club impact marker
US4079935A (en) * 1973-11-09 1978-03-21 Zimm-Zamm Aktiengesellschaft Sports equipment
US4323246A (en) * 1979-09-28 1982-04-06 Nehrbas Jr George M Golf practice putting aid
US4432551A (en) * 1981-07-10 1984-02-21 Chen Richard M Golfer's training aid
US4603862A (en) * 1981-11-16 1986-08-05 Chen Richard M Golf ball with alignment marker
WO1990002586A1 (en) * 1988-09-05 1990-03-22 Robert Mackean Agnew Impact recorder
US4974851A (en) * 1990-01-16 1990-12-04 Closser Daniel P Golf club impact making device and method
US4989876A (en) * 1987-12-03 1991-02-05 Hawkins Sr Arnold R Practice golf club and system
US5033746A (en) * 1990-07-09 1991-07-23 Jones Michael D Golf club ball-impact marker
US5083778A (en) * 1988-02-18 1992-01-28 Douglass Michael B Golf club putter head
US5120358A (en) * 1989-08-24 1992-06-09 Pippett Robert J Golf practice aid
US5142309A (en) * 1988-06-09 1992-08-25 Consumer Advantage Marketing Group, Inc. Golf club impact recording system
US5337670A (en) * 1994-01-06 1994-08-16 Chung Ming Huang Process for the transfer printing of a gulf club head
US5445386A (en) * 1994-09-21 1995-08-29 Marshall; Perry C. Device for changing hardness of putter striking face
US5467538A (en) * 1994-09-30 1995-11-21 Acushnet Company Method and apparatus of determining golfer's effective putter loft
US5609530A (en) * 1995-08-31 1997-03-11 Emhart Inc. Dynamic lie determination device and method
US5688190A (en) * 1996-02-07 1997-11-18 The Spin Doctor, Ltd. Removable adhesive backed pads for golf club striking surfaces
US5690561A (en) * 1996-02-07 1997-11-25 The Spin Doctor, Ltd. Removable adhesive backed pads for golf club striking surfaces
US5779556A (en) * 1996-07-16 1998-07-14 Cervantes; Eduardo Golf club point of impact and relative club velocity indicator
US5830077A (en) * 1997-06-13 1998-11-03 Yavitz; Edward Q. Impact detector for use with a golf club
US5893806A (en) * 1994-10-12 1999-04-13 Martinez; Rodolfo Batting instruction method and apparatus
US6015353A (en) * 1998-09-02 2000-01-18 Romano; Edward A Golf swing stroke-error-signalling sensor
US6045465A (en) * 1997-04-03 2000-04-04 Alfano; Robert R. Baseball training bat with colored transferable bands
US6224496B1 (en) 1998-03-05 2001-05-01 The Spin Doctor, Ltd. Golf club head with removable insert
US6309315B1 (en) * 1999-07-13 2001-10-30 Thomas H. Adams Golf tee marking system and method of use
WO2003031000A1 (en) * 2001-10-05 2003-04-17 Alpha Art Materials Co.Ltd. Sticker for recording location of impact of ball on golf club head
US20030087708A1 (en) * 2001-11-07 2003-05-08 Richard Tiffin Divot practice mat
US20030134686A1 (en) * 2002-01-11 2003-07-17 Steven Arkley Golf putting trainer
US20030216189A1 (en) * 2001-11-07 2003-11-20 Tiffin Richard Edward Divot practice mat
US20040074125A1 (en) * 2002-10-17 2004-04-22 Johnson Patrick G. Iron-wood golf club head accessory
WO2004052467A2 (en) * 2002-12-06 2004-06-24 Matthews John P Apparatus and method for recording the impact location between a golf ball and a golf club
US20040254026A1 (en) * 2003-06-10 2004-12-16 Tom David, Inc. Self-sticking pad for a golf club
US20050026713A1 (en) * 2001-07-27 2005-02-03 Spencer David P. Golf head and shaft with flex neutralization and method for manufacturing same
US20050153790A1 (en) * 2004-01-13 2005-07-14 Lester David B. Training aid that generates an impression on a hitting instrument
US20070155521A1 (en) * 2005-09-16 2007-07-05 Hauk Thomas D Golf Swing Practice System
US20070184912A1 (en) * 2006-02-09 2007-08-09 Delucia Victor E Golf club head with bi-polar magnetic impact detectors
US20080176669A1 (en) * 2007-01-23 2008-07-24 David Patrick Spencer Golf Shaft and Club Flex Neutralization/Matching and Method for Manufacturing Same
US20080254907A1 (en) * 2007-04-13 2008-10-16 Karsten Manufacturing Corporation Methods and Apparatus to Indicate Impact of an Object
US20090005191A1 (en) * 2007-06-27 2009-01-01 Taylor Made Golf Company, Inc. Golf club head and face insert
US20120115625A1 (en) * 2010-11-08 2012-05-10 Todd Comi System, device, and method for improving sports swing striking accuracy
US20140274439A1 (en) * 2013-03-15 2014-09-18 Sanwood Llc Impact Indication and Data Tracking Devices and Methods
US20140274438A1 (en) * 2013-03-15 2014-09-18 Nike, Inc. Fitting A Golf Ball Using A Strike Characteristics Detector
US20140371008A1 (en) * 2013-06-12 2014-12-18 Steven P. Geotsalitis Baseball bat swing training device
US20160038795A1 (en) * 2014-08-08 2016-02-11 Dunlop Sports Company Limited Branded weighting system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US566101A (en) * 1896-08-18 Golf-stick
US1464029A (en) * 1923-08-07 Oliver coughtrie
US1485089A (en) * 1922-12-23 1924-02-26 Alvin J Musselman Golf target
US2030135A (en) * 1932-11-01 1936-02-11 Ad Here Paper Company Adhesive unit
US2495679A (en) * 1948-04-05 1950-01-31 Abrecht Rudy Marking attachment for golf clubs

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US566101A (en) * 1896-08-18 Golf-stick
US1464029A (en) * 1923-08-07 Oliver coughtrie
US1485089A (en) * 1922-12-23 1924-02-26 Alvin J Musselman Golf target
US2030135A (en) * 1932-11-01 1936-02-11 Ad Here Paper Company Adhesive unit
US2495679A (en) * 1948-04-05 1950-01-31 Abrecht Rudy Marking attachment for golf clubs

Cited By (76)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071379A (en) * 1959-07-20 1963-01-01 Joseph A Canfield Device for checking golf swing
US3088321A (en) * 1960-05-12 1963-05-07 Lathrop John Douglas Head speed indicator for golf clubs
US3137507A (en) * 1961-09-14 1964-06-16 David A Pickler Golf practice device and method
US3081091A (en) * 1962-03-08 1963-03-12 Craig H Grow Practice ball
US3516675A (en) * 1966-05-13 1970-06-23 Brunswick Corp Golf game apparatus
US3437341A (en) * 1967-01-04 1969-04-08 Gen Standard Co Practice golf club
US3754764A (en) * 1972-04-27 1973-08-28 F Manheck Golf club impact marker
US4079935A (en) * 1973-11-09 1978-03-21 Zimm-Zamm Aktiengesellschaft Sports equipment
US4323246A (en) * 1979-09-28 1982-04-06 Nehrbas Jr George M Golf practice putting aid
US4432551A (en) * 1981-07-10 1984-02-21 Chen Richard M Golfer's training aid
US4603862A (en) * 1981-11-16 1986-08-05 Chen Richard M Golf ball with alignment marker
US4989876A (en) * 1987-12-03 1991-02-05 Hawkins Sr Arnold R Practice golf club and system
US5083778A (en) * 1988-02-18 1992-01-28 Douglass Michael B Golf club putter head
US5142309A (en) * 1988-06-09 1992-08-25 Consumer Advantage Marketing Group, Inc. Golf club impact recording system
WO1990002586A1 (en) * 1988-09-05 1990-03-22 Robert Mackean Agnew Impact recorder
US5120358A (en) * 1989-08-24 1992-06-09 Pippett Robert J Golf practice aid
US4974851A (en) * 1990-01-16 1990-12-04 Closser Daniel P Golf club impact making device and method
WO1992000783A1 (en) * 1990-07-09 1992-01-23 Jones Michael D Golf club ball-impact marker
US5033746A (en) * 1990-07-09 1991-07-23 Jones Michael D Golf club ball-impact marker
US5337670A (en) * 1994-01-06 1994-08-16 Chung Ming Huang Process for the transfer printing of a gulf club head
US5445386A (en) * 1994-09-21 1995-08-29 Marshall; Perry C. Device for changing hardness of putter striking face
US5467538A (en) * 1994-09-30 1995-11-21 Acushnet Company Method and apparatus of determining golfer's effective putter loft
US5893806A (en) * 1994-10-12 1999-04-13 Martinez; Rodolfo Batting instruction method and apparatus
US5609530A (en) * 1995-08-31 1997-03-11 Emhart Inc. Dynamic lie determination device and method
US5690561A (en) * 1996-02-07 1997-11-25 The Spin Doctor, Ltd. Removable adhesive backed pads for golf club striking surfaces
US5688190A (en) * 1996-02-07 1997-11-18 The Spin Doctor, Ltd. Removable adhesive backed pads for golf club striking surfaces
US5779556A (en) * 1996-07-16 1998-07-14 Cervantes; Eduardo Golf club point of impact and relative club velocity indicator
US6045465A (en) * 1997-04-03 2000-04-04 Alfano; Robert R. Baseball training bat with colored transferable bands
US5830077A (en) * 1997-06-13 1998-11-03 Yavitz; Edward Q. Impact detector for use with a golf club
US6224496B1 (en) 1998-03-05 2001-05-01 The Spin Doctor, Ltd. Golf club head with removable insert
US6015353A (en) * 1998-09-02 2000-01-18 Romano; Edward A Golf swing stroke-error-signalling sensor
US20060128506A1 (en) * 1999-07-13 2006-06-15 Adams Thomas H Golf teaching system and method
US6506131B2 (en) * 1999-07-13 2003-01-14 Thomas H. Adams Golf tee marking system and method of use
US20050101413A1 (en) * 1999-07-13 2005-05-12 Adams Thomas H. Golf teaching system and method
US6832964B2 (en) 1999-07-13 2004-12-21 Thomas H. Adams Golf teaching system and method
US7481725B2 (en) 1999-07-13 2009-01-27 Adams Thomas H Swing teaching system and method
US6309315B1 (en) * 1999-07-13 2001-10-30 Thomas H. Adams Golf tee marking system and method of use
US6692382B2 (en) 1999-07-13 2004-02-17 Thomas H. Adams Golf tee marking system and method of use
US6997822B2 (en) 1999-07-13 2006-02-14 Adams Thomas H Golf teaching system and method
US20080015043A1 (en) * 1999-07-13 2008-01-17 Adams Thomas H Swing Teaching System and Method
US20040162153A1 (en) * 1999-07-13 2004-08-19 Adams Thomas H. Golf tee marking system and method of use
US7238124B2 (en) 1999-07-13 2007-07-03 Adams Thomas H Golf teaching system and method
US6895680B2 (en) * 2001-07-27 2005-05-24 David P. Spencer Golf head and shaft with flex neutralization and method for manufacturing same
US20050026713A1 (en) * 2001-07-27 2005-02-03 Spencer David P. Golf head and shaft with flex neutralization and method for manufacturing same
WO2003031000A1 (en) * 2001-10-05 2003-04-17 Alpha Art Materials Co.Ltd. Sticker for recording location of impact of ball on golf club head
US20030087708A1 (en) * 2001-11-07 2003-05-08 Richard Tiffin Divot practice mat
US20030216189A1 (en) * 2001-11-07 2003-11-20 Tiffin Richard Edward Divot practice mat
US6913544B2 (en) * 2001-11-07 2005-07-05 The Tiffin Company, Inc. Divot practice mat
US20030134686A1 (en) * 2002-01-11 2003-07-17 Steven Arkley Golf putting trainer
US20040074125A1 (en) * 2002-10-17 2004-04-22 Johnson Patrick G. Iron-wood golf club head accessory
WO2004052467A2 (en) * 2002-12-06 2004-06-24 Matthews John P Apparatus and method for recording the impact location between a golf ball and a golf club
WO2004052467A3 (en) * 2002-12-06 2004-11-04 John P Matthews Apparatus and method for recording the impact location between a golf ball and a golf club
US7086956B2 (en) * 2002-12-06 2006-08-08 Matthews John P Apparatus and method for recording the impact location between a golf ball and a golf club
US20050233820A1 (en) * 2002-12-06 2005-10-20 Matthews John P Apparatus and method for recording the impact location between a golf ball and a golf club
WO2004073803A3 (en) * 2003-02-20 2005-08-18 Tiffin Company Inc Divot practice mat
US20040254026A1 (en) * 2003-06-10 2004-12-16 Tom David, Inc. Self-sticking pad for a golf club
US7134967B2 (en) * 2004-01-13 2006-11-14 David Lester Training aid that generates an impression on a hitting instrument
US20050153790A1 (en) * 2004-01-13 2005-07-14 Lester David B. Training aid that generates an impression on a hitting instrument
US20070155521A1 (en) * 2005-09-16 2007-07-05 Hauk Thomas D Golf Swing Practice System
US7594858B2 (en) * 2005-09-16 2009-09-29 Hawknest Engineering Llc Golf swing practice system
US7311612B2 (en) 2006-02-09 2007-12-25 Delucia Victor E Golf club head with bi-polar magnetic impact detectors
US20070184912A1 (en) * 2006-02-09 2007-08-09 Delucia Victor E Golf club head with bi-polar magnetic impact detectors
US20080176669A1 (en) * 2007-01-23 2008-07-24 David Patrick Spencer Golf Shaft and Club Flex Neutralization/Matching and Method for Manufacturing Same
US7415867B2 (en) * 2007-01-23 2008-08-26 David Patrick Spencer Golf shaft and club flex neutralization/matching and method for manufacturing same
US8092315B2 (en) 2007-04-13 2012-01-10 Karsten Manufacturing Corporation Methods and apparatus to indicate impact of an object
US20080254907A1 (en) * 2007-04-13 2008-10-16 Karsten Manufacturing Corporation Methods and Apparatus to Indicate Impact of an Object
US20090005191A1 (en) * 2007-06-27 2009-01-01 Taylor Made Golf Company, Inc. Golf club head and face insert
US9409066B2 (en) 2007-06-27 2016-08-09 Taylor Made Golf Company, Inc. Golf club head and face insert
US8684864B2 (en) 2007-06-27 2014-04-01 Taylor Made Golf Company, Inc. Golf club head and face insert
US7985146B2 (en) * 2007-06-27 2011-07-26 Taylor Made Golf Company, Inc. Golf club head and face insert
US20120115625A1 (en) * 2010-11-08 2012-05-10 Todd Comi System, device, and method for improving sports swing striking accuracy
US20150024863A1 (en) * 2010-11-08 2015-01-22 Todd Comi System, device, and method for improving sports swing striking accuracy
US20140274439A1 (en) * 2013-03-15 2014-09-18 Sanwood Llc Impact Indication and Data Tracking Devices and Methods
US20140274438A1 (en) * 2013-03-15 2014-09-18 Nike, Inc. Fitting A Golf Ball Using A Strike Characteristics Detector
US20140371008A1 (en) * 2013-06-12 2014-12-18 Steven P. Geotsalitis Baseball bat swing training device
US20160038795A1 (en) * 2014-08-08 2016-02-11 Dunlop Sports Company Limited Branded weighting system

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