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Golfing iron head with downwardly tapered keel
Patent #: 3961796
Issued on: 06/08/1976
Inventor: Thompson
Golf club head
Patent #: 3995865
Issued on: 12/07/1976
Inventor: Cochran , et al.
Golf club with low density and high inertia head
Patent #: 4076254
Issued on: 02/28/1978
Inventor: Nygren
Golfing iron with weight adjustment
Patent #: 4145052
Issued on: 03/20/1979
Inventor: Janssen , et al.
Weight adjustment of golfing iron heads
Patent #: 4180269
Issued on: 12/25/1979
Inventor: Thompson
Reinforced metal shell golf club head, with keel
Patent #: 4313607
Issued on: 02/02/1982
Inventor: Thompson
Method of making metal golf club head
Patent #: 4326326
Issued on: 04/27/1982
Inventor: MacDonald
Weighted golf iron
Patent #: 4340230
Issued on: 07/20/1982
Inventor: Churchward
Weighted, inlaid golf iron and method of making same
Patent #: 4355808
Issued on: 10/26/1982
Inventor: Jernigan , et al.
Golf club head
Patent #: 4582321
Issued on: 04/15/1986
Inventor: Yoneyama
Club-head
Patent #: 4690408
Issued on: 09/01/1987
Inventor: Kobayashi
Golf club
Patent #: 4754977
Issued on: 07/05/1988
Inventor: Sahm
Process for desulphurization of flue gas
Patent #: 4792440
Issued on: 12/20/1988
Inventor: Nielsen , et al.
Golf club
Patent #: 4793616
Issued on: 12/27/1988
Inventor: Fernandez
Golf club head
Patent #: 4824115
Issued on: 04/25/1989
Inventor: Walther
Golf club head
Patent #: 4826172
Issued on: 05/02/1989
Inventor: Antonious
Club head for an iron-type golf club
Patent #: 4836550
Issued on: 06/06/1989
Inventor: Kobayashi
Method and apparatus for molding golf club heads
Patent #: 4842243
Issued on: 06/27/1989
Inventor: Butler
Head structure for gold clubs
Patent #: 4852880
Issued on: 08/01/1989
Inventor: Kobayashi
Golf club, set of golf clubs, and method of producing the same
Patent #: 4941666
Issued on: 07/17/1990
Inventor: Suganuma
Hollow golf club head with internal support
Patent #: 4944515
Issued on: 07/31/1990
Inventor: Shearer
Iron club head for golf
Patent #: 4964640
Issued on: 10/23/1990
Inventor: Nakanishi, et al.
Golf club with electrical discharge machined face
Patent #: 4964641
Issued on: 10/23/1990
Inventor: Miesch, et al.
Golf club head and process for its fabrication
Patent #: 4988104
Issued on: 01/29/1991
Inventor: Shiotani, et al.
Method of making a golf club head and the article produced thereby
Patent #: 4992236
Issued on: 02/12/1991
Inventor: Shira
Golf club head
Patent #: 5009425
Issued on: 04/23/1991
Inventor: Okumoto, et al.
Golf driver with variable weighting for changing center of gravity
Patent #: 5050879
Issued on: 09/24/1991
Inventor: Sun, et al.
Golf club head
Patent #: 5078397
Issued on: 01/07/1992
Inventor: Aizawa
Wood-type golf club head
Patent #: 5080366
Issued on: 01/14/1992
Inventor: Okumoto, et al.
Golf clubs and method of making thereof
Patent #: 5104457
Issued on: 04/14/1992
Inventor: Viljoen, et al.
Golf club head with high toe and low heel weighting
Patent #: 5120062
Issued on: 06/09/1992
Inventor: Scheie, et al.
Method of molding a golf club head
Patent #: 5143571
Issued on: 09/01/1992
Inventor: Lacoste, et al.
Golf club and golf club head
Patent #: 5184823
Issued on: 02/09/1993
Inventor: Desboilles, et al.
Head for golf club
Patent #: 5190290
Issued on: 03/02/1993
Inventor: Take
Wood type golf club head
Patent #: 5193811
Issued on: 03/16/1993
Inventor: Okumoto, et al.
Method of making golf club head
Patent #: 5198062
Issued on: 03/30/1993
Inventor: Chen
Metal golf clubs with inserts
Patent #: 5221087
Issued on: 06/22/1993
Inventor: Fenton, et al.
Iron golf club head made of fiber-reinforced resin
Patent #: 5228694
Issued on: 07/20/1993
Inventor: Okumoto, et al.
One-body precision cast metal wood and process to form same
Patent #: 5261478
Issued on: 11/16/1993
Inventor: Sun
Hydraulic apparatus with pressure compensating valves
Patent #: 5271227
Issued on: 12/21/1993
Inventor: Akiyama, et al.
Iron golf club head with dual intersecting recesses
Patent #: 5282625
Issued on: 02/01/1994
Inventor: Schmidt, et al.
Cavity back iron with vibration dampening material in rear cavity
Patent #: 5290036
Issued on: 03/01/1994
Inventor: Fenton, et al.
Golf club head with increased radius of gyration and face reinforcement
Patent #: 5301941
Issued on: 04/12/1994
Inventor: Allen
Composite weighted golf club heads
Patent #: 5312106
Issued on: 05/17/1994
Inventor: Cook
Golf club head
Patent #: 5333871
Issued on: 08/02/1994
Inventor: Wishon
Golf club irons having improved weighting
Patent #: 5333872
Issued on: 08/02/1994
Inventor: Manning, et al.
Composite golf club head
Patent #: 5342812
Issued on: 08/30/1994
Inventor: Niskanen, et al.
Golf club head and method of forming same
Patent #: 5344140
Issued on: 09/06/1994
Inventor: Anderson
Golf club head
Patent #: 5348302
Issued on: 09/20/1994
Inventor: Sasamoto, et al.
Golf club heads with means for imparting corrective action
Patent #: 5354059
Issued on: 10/11/1994
Inventor: Stuff
Golf club head construction
Patent #: 5380010
Issued on: 01/10/1995
Inventor: Werner, et al.
Method and system for providing custom designed golf clubs having replaceable swing weight inserts
Patent #: 5385348
Issued on: 01/31/1995
Inventor: Wargo
Golf club head with integrally cast sole plate and fabrication method for same
Patent #: 5398746
Issued on: 03/21/1995
Inventor: Igarashi
Golf club head and insert
Patent #: 5405137
Issued on: 04/11/1995
Inventor: Vincent, et al.
Metallic golf clubhead
Patent #: 5421577
Issued on: 06/06/1995
Inventor: Kobayashi
Polymer filled perimeter weighted golf clubs
Patent #: 5425535
Issued on: 06/20/1995
Inventor: Gee
Tin bismuth solder paste, and method using paste to form connection having improved high temperature properties
Patent #: 5429292
Issued on: 07/04/1995
Inventor: Melton, et al.
Golf putter
Patent #: 5431401
Issued on: 07/11/1995
Inventor: Smith
Golf club head of composite material
Patent #: 5435551
Issued on: 07/25/1995
Inventor: Chen
Golf club head
Patent #: 5439223
Issued on: 08/08/1995
Inventor: Kobayashi
Iron type golf club head
Patent #: 5447311
Issued on: 09/05/1995
Inventor: Viollaz, et al.
Low center of gravity golf club
Patent #: 5451058
Issued on: 09/19/1995
Inventor: Price, et al.
Golf putter head with undercut back cavity and peripheral weighting
Patent #: 5464218
Issued on: 11/07/1995
Inventor: Schmidt, et al.
Iron golf club head with dual intersecting recesses
Patent #: 5472203
Issued on: 12/05/1995
Inventor: Schmidt, et al.
Golf clubs for hitting low trajectory shots
Patent #: 5474297
Issued on: 12/12/1995
Inventor: Levin
Golf club metal wood-type head with improved perimeter structure and weight configuration
Patent #: 5482279
Issued on: 01/09/1996
Inventor: Antonious
Golf club head and method of its fabrication
Patent #: 5489098
Issued on: 02/06/1996
Inventor: Gojny, et al.
Shock Absorbing iron head
Patent #: 5492327
Issued on: 02/20/1996
Inventor: Biafore, Jr.
Golf club head
Patent #: 5494281
Issued on: 02/27/1996
Inventor: Chen
Structure of golf club head
Patent #: 5497993
Issued on: 03/12/1996
Inventor: Shan
Golf club head and a method for producing the same
Patent #: 5499819
Issued on: 03/19/1996
Inventor: Nagamoto
Golf club head with integrally cast sole plate
Patent #: 5509659
Issued on: 04/23/1996
Inventor: Igarashi
Wood type golf club head
Patent #: 5516107
Issued on: 05/14/1996
Inventor: Okumoto, et al.
Golf club head
Patent #: 5522593
Issued on: 06/04/1996
Inventor: Kobayashi, et al.
Perimeter weighted golf clubs
Patent #: 5540437
Issued on: 07/30/1996
Inventor: Bamber
Golf club head with peripheral balance weights
Patent #: 5564705
Issued on: 10/15/1996
Inventor: Kobayashi, et al.
Golf club head having an inner subassembly and an outer casing and method of manufacture
Patent #: 5570886
Issued on: 11/05/1996
Inventor: Rigal, et al.
Golf club head with attached selected swing weight composite
Patent #: 5588923
Issued on: 12/31/1996
Inventor: Schmidt, et al.
Weighted golf iron and method of making same
Patent #: 5590881
Issued on: 01/07/1997
Inventor: Jernigan
Method of manufacturing golf club head with integral insert
Patent #: 5595234
Issued on: 01/21/1997
Inventor: Beck
Method of manufacturing golf club head with integral insert
Patent #: 5595548
Issued on: 01/21/1997
Inventor: Beck
Iron type golf club head
Patent #: 5601501
Issued on: 02/11/1997
Inventor: Kobayashi
Iron type golf club head with improved sole configuration
Patent #: 5603668
Issued on: 02/18/1997
Inventor: Antonious
Wood-type golf club head
Patent #: 5611742
Issued on: 03/18/1997
Inventor: Kobayashi
Composite-metal golf club head
Patent #: 5624331
Issued on: 04/29/1997
Inventor: Lo, et al.
Golf club head with sole bevel indicia
Patent #: 5626530
Issued on: 05/06/1997
Inventor: Schmidt, et al.
Golf clubs with elastomeric vibration dampener
Patent #: 5643111
Issued on: 07/01/1997
Inventor: Igarashi
Golf club head with improved weight configuration
Patent #: 5655976
Issued on: 08/12/1997
Inventor: Rife
Golf club head
Patent #: 5658208
Issued on: 08/19/1997
Inventor: Shimasaki
Iron-type golf club head
Patent #: 5665013
Issued on: 09/09/1997
Inventor: Kobayashi
Structure of golf club head
Patent #: 5669826
Issued on: 09/23/1997
Inventor: Chang, et al.
Structure of golf club head
Patent #: 5674133
Issued on: 10/07/1997
Inventor: Chang, et al.
Method for manufacturing iron-type golf club head
Patent #: 5676605
Issued on: 10/14/1997
Inventor: Kobayashi
Golf putter
Patent #: 5676606
Issued on: 10/14/1997
Inventor: Schaeffer, et al.
Golf club head having air-accommodation passages
Patent #: 5681227
Issued on: 10/28/1997
Inventor: Sayrizi
Structure of golf club head
Patent #: 5704850
Issued on: 01/06/1998
Inventor: Shieh
Golf club head
Patent #: 5749794
Issued on: 05/12/1998
Inventor: Kobayashi, et al.
Iron golf club head with dual intersecting recesses
Patent #: 5749795
Issued on: 05/12/1998
Inventor: Schmidt, et al.
Investment casting of golf club heads with high density inserts
Patent #: 5766091
Issued on: 06/16/1998
Inventor: Humphrey, et al.
"Iron"-type golf club head
Patent #: 5766092
Issued on: 06/16/1998
Inventor: Mimeur, et al.
Metal wood golf club head
Patent #: 5769735
Issued on: 06/23/1998
Inventor: Hosokawa
Weight structure on a golf club head
Patent #: 5776010
Issued on: 07/07/1998
Inventor: Helmstetter, et al.
Iron golf club head Patent #: 5833551
Issued on: 11/10/1998
Inventor: Vincent, et al.
June 11, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
