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| Title | Primary Class | Description | Inventor | Assignee | Issue Date | Patent No. |
| Equalization of Carrier Transmissions | 333/16 | Electro-mechanical adjustable equalizer | Herman A. Affel | American Telephone and Telegraph Company (AT&T) | October 7, 1924 | US1,511,013 |
| Piezo-Electric Interference Eliminator | 333/187 | Interference eliminator for radio transmission systems | Herman A. Affel | American Telephone and Telegraph Company (AT&T) | December 17, 1929 | US1,739,494 |
| Concentric Conduction System | 174/28 | Wideband coaxial cable transmission | Herman A. Affel; Estill I. Green |
American Telephone and Telegraph Company (AT&T) | November 11, 1930 | US1,781,092 |
| Concentric Conduction System | 348/14.01 | Coaxial cable | Lloyd Espenschied; Herman Affel |
American Telephone and Telegraph Company (AT&T) | December 8, 1931 | US1,835,031 |
