| US Patent: 2,046,839 
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| Screw | 
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| Patentees: |  
 | Henry F. Phillips (exact or similar names) - Portland, OR |  | Thomas M. Fitzpatrick (exact or similar names) - Portland, OR |  
 
 
 
 
 
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| Patent Dates: |  
| Applied: | Jan. 15, 1935 |  
| Granted: | Jul. 07, 1936 |  USPTO (New site tip)
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                        Russ Allen.
 
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| Description: |  | Improvement of Phillips previous application of 9 May 1933.  Companion patent with the corresponding screwdriver 2046838. |  |