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| Patents for Joseph A. Sprague | |||||
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| Picture | Number | Date | Patentee | Title | |
| D129,108 | Aug. 26, 1941 | J.A. Sprague | Camera Carrying Case | ||
| 2,353,896 | Jul. 18, 1944 | J.A. Sprague | Photographic Synchronizer Testing Equipmqnt | ||
| 2,353,897 | Jul. 18, 1944 | J.A. Sprague | Sensitized Material Holder or Carrier for Photographic Synchronizer Testing Equipment | ||
| 2,362,863 | Nov. 14, 1944 | B.D. Chamberlin, J.A. Sprague | Photoflash Synchronizer Device | ||
| 2,499,691 | Mar. 07, 1950 | J.A. Sprague | Selectively-Active Infinity Stop for Cameras | ||