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| Patents for Nancy C. Rittmann | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,718,127 | Jan. 12, 1988 | S.R. Wente, R.S. Stever, N.C. Rittmann | Helmet Visor with Locking Hinge Assemble | ||
| 4,934,222 | Jun. 19, 1990 | D.D. Grover, N.C. Rittmann | Ergonomic Tool | pliers | |
| 4,982,612 | Jan. 08, 1991 | N.C. Rittmann | Torque Wrench with Measurements Independent of Hand-Hold Position | torque wrenches | |