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| Patents for Park D. Ritchey | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,628,741 | May 17, 1927 | R.A. Holt, P.D. Ritchey | Adjustable Pin Gauge | ||
| 1,928,001 | Sep. 26, 1933 | C.E. Ruf, L.G. Spealman, P.D. Ritchey, E.H. Aldeborgh | Projection Indicator Measuring Instrument | ||