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| Patents for John B. Rolfe | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,959,408 | Nov. 08, 1960 | J.B. Rolfe | Weighing Scale Counterpoise Apparatus | ||
| 3,010,426 | Nov. 28, 1961 | J.B. Rolfe | Scale Pointer Index | ||
| 3,031,021 | Apr. 24, 1962 | J.B. Rolfe, J.D. Hale | Magnetic Balance Indicator | ||
| 3,260,321 | Jul. 12, 1966 | J.B. Rolfe, R.H. Damon, Jr. | Dual Capacity Scale with Disengageable Counterweight on Load Transmission Rod | ||