Patent ID: 11896880
Assignee: KARSTEN MANUFACTURING CORPORATION
Field: Furniture, games (Other fields)
Classification: CPC A | IPC A

Claim 16:
17. A putter shaft comprising:
a tubular body comprising:
a plurality of bias plies and a plurality of longitudinal plies;

wherein: the plurality of bais plies comprise a graphite composite with a modulus greater than 60 msi and the plurality of longitudinal plies comprise a graphite composite with a modulus value between 54 msi and 56 msi;
a tip end; and
a butt end;
wherein:
the putter shaft has a length, measured between the tip end and the butt end, that is inclusively between 32 inches and 38 inches;
the putter shaft is hollow and comprises a wall thickness defined by an inner diameter (ID) and an outer diameter (OD);
the putter shaft further comprises a tip ID and a tip OD;
the tip ID and the tip OD are measured at the furthest portion of the tip end;
the putter shaft comprises an ultra-high stiffness as evidenced by a frequency value of greater than 650 cpm and a frequency ratio (RF) between 5.5 and 8;
the frequency value of the putter shaft is the number of oscillations that the tip end undergoes per minute when a first 6 inches of the butt end is clamped, a 205 gram weight is attached onto the tip end, and the tip end has been displaced and released; wherein the frequency value is measured within the first 2 to 10 oscillation cycles; and
the frequency ratio is calculated by the following equation:, R
    F
  
  =
  
    
      Frequency
      
        
          10
          ⁢
          
            ,
          
          ⁢
          0
          ⁢
          0
          ⁢
          0
          ×
          
            (
            
              Tip
              ⁢
              
                
              
              ⁢
              OD
            
            )
          
        
        +
        
          Shaft
          ⁢
          
            
          
          ⁢
          Mass
        
      
    
    .