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| Patents for Diaphone Signal Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| NF-1,904,001 | Feb. 01, 1904 | J.P. Northey | Sound producing devices for syrens and like instruments | nautical fog signals | |
| NF-1,906,027 | Oct. 01, 1906 | J.P. Northey | Improvements in sound producing devices, suitable for syrens and like instruments | nautical fog signals | |
| NF-1,911,014 | Jun. 26, 1911 | J.P. Northey | Sound producing devices for fog signalling, position locating, and the like | nautical fog signals | |