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| Patents for Charles Zelnick | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,042,990 | Jul. 10, 1962 | C. Zelnick | Woven type measuring tape | ||
| 3,044,731 | Jul. 17, 1962 | C. Zelnick | Tape measure construction | tape measures | |
| 3,145,759 | Aug. 25, 1964 | A.D. Swartz, H.A. Doster, C. Zelnick | Apparatus for making power springs | ||
| D206,457 | Dec. 13, 1966 | C. Zelnick | Measuring Tape | tape measures | |
| 3,330,709 | Jul. 11, 1967 | C. Zelnick | Methods of making coilable measuring tape of plastic material | tape measures | |