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John Hanert and Don Leslie were separately the architects of the Hammond sound. Hanert worked for the Hammond company, which officially decreed that Leslie and all his works were anathema.
Here is a sampling of patents by Hanert, Leslie, Laurens Hammond, and several others from the Hammond Corporation. The links point to the Delphion patent server, which lets you do some simple searches on patents granted since 1971. Delphion also has links to many older patents which are referenced by the newer patents. So a search on "Hanert" finds a lot of patents by others which reference one of Hanert's patetnts.
Delphion lets you look at the first page of a patent for free, and has several options for ordering the full patent in a variety of formats.
| Number | Title | overview | detail page 1 | granted to | date granted | date applied for |
| 2,342,338 | Electrical Musical Instruments | overview | page 1 | J.M. Hanert | February 22, 1944 | June 20, 1942 | 2,429,226 | Electrical Musical Instrument | overview | page 1 | J.M. Hanert | October 21, 1947 | September 14, 1942 | 2,499,244 | Pedal Clavier for Musical Instruments | overview | page 1 | L. Hammond et al. | February 28, 1950 | February 27, 1948 | 2,509,923 | Electrical Musical Apparatus | overview | page 1 | J.M. Hanert | May 30, 1950 | March 8, 1946 | 2,577,753 | Electrical Musical Instrument with Tone Sustaining Means | overview | page 1 | J.M. Hanert | December 11, 1951 | August 22, 1949 | 2,580,424 | Vibrato Apparatus for Electrical Musical Instruments | overview | page 1 | J.M. Hanert | January 1, 1952 | August 22, 1949 | 2,622,692 | Apparatus for Imposing Vibrato on Sound | overview | page 1 | D.J. Leslie | December 23, 1952 | July 9, 1945 | 2,622,693 | Apparatus for Imposing Vibrato on Sound | overview | page 1 | D.J. Leslie | December 23, 1952 | July 9, 1945 | 2,626,325 | Pedal Clavier Switch Mechanism | overview | page 1 | L. Hammond et al. | January 20, 1953 | November 2, 1949 | 2,646,468 | Ear Response Compensated Volume Control Apparatus | overview | page 1 | J.M. Hanert | July 21, 1953 | February 1, 1950 | 2,687,665 | Electrical Musical Instrument | overview | page 1 | J.M. Hanert | August 31, 1954 | November 2, 1951 |
| 2,790,906 | Electronic Oscillator | overview | page 1 | L. Hammond | April 30, 1957 | May 28, 1949 | 2,828,659 | Electrical Musical Instruments | overview | page 1 | J.M. Hanert | April 1, 1958 | July 12, 1954 | 2,835,876 | Adjustable Inductance | overview | page 1 | J.M. Hanert | May 20, 1958 | August 18, 1950 | 2,846,913 | Circular Scale Electrical Musical Instrument | overview | page 1 | L. Hammond et al. | January 20, 1953 | November 2, 1949 |
| 2,878,708 | Capacitive Switching Apparatus | overview | page 1 | J.M. Hanert | March 24, 1959 | October 3, 1956 |
| 2,922,329 | Electrical Musical Instrument with Multiple Utilization of Tone Signal Sources | overview | page 1 | J.M. Hanert | January 26, 1960 | February 2, 1956 |
| 2,933,004 | Combined Piano and Monophonic Instrument | overview | page 1 | W.J. Wehrmann (Hammond?) | July 12, 1966 | November 5, 1964 |
| 2,943,527 | Adjustable Tune Producing Instrumentality | overview | page 1 | J.M. Hanert | July 5, 1960 | September 16, 1957 |
| 2,953,056 | Percussion Tone Electrical Musical Instrument | overview | page 1 | J.M. Hanert | September 20, 1960 | March 13, 1957 |
| 2,967,477 | Apparatus for Translating Electrical Musical Tone Signals into Sound | overview | page 1 | J.M. Hanert | January 10, 1961 | March 6, 1957 |
| 2,972,273 | Polyphonic Percussion Control Apparatus | overview | page 1 | J.M. Hanert | February 21, 1961 | March 12, 1958 |
| 3,048,072 | Apparatus for Producing Psuedo-Stereophonic Effects | overview | page 1 | J.M. Hanert | August 7, 1962 | April 27, 1960 |
| 3,051,032 | Single Manual Double Countermelody Electrical Musical Instrument | overview | page 1 | J.M. Hanert | August 28, 1962 | March 18, 1959 |
| 3,058,541 | Rotary Electrostatic Speaker | overview | page 1 | D.J. Leslie | October 16, 1962 | July 9, 1956 |
| 3,070,659 | Artificial Reverberation Control Apparatus | overview | page 1 | J.M. Hanert | December 25, 1962 | June 4, 1959 |
| 3,109,878 | Percussion Tone Monophonic Electrical Musical Instrument | overview | page 1 | J.M. Hanert | December 25, 1962 | June 4, 1959 |
| 3,260,784 | Electronic Musical Instrument Having One or More Keyboards | overview | page 1 | W.J. Wehrmann (Hammond?) | July 12, 1966 | November 5, 1964 |
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