Henry E. Warren received many patents for battery driven clocks, synchronous electric clock systems, clock motors, movements, etc. Some selected ones are listed here.
Synchronous Motor Patents |
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Patent Number |
Issue Date |
Filing Date |
Title |
Summary |
| 1,283,431 | Oct. 29, 1918 | Aug. 21, 1916 | Electric Clock System | A system of A/C electric clocks, a means for regulating the generator and comparing it with a separate master clock, and the type A motor |
1,283,432 |
Oct. 29, 1918 |
Dec. 26, 1916 |
Self-Starting Synchronous Motor |
Basic motor idea. |
1,283,433 |
Oct. 29, 1918 |
Feb. 5, 1917 |
Self-Starting Synchronous Motor |
Rotor and stator are in a sealed housing. Rotor can be uncoupled from load while starting. Synchronizing element can be removed from maximum influence of magnetic field and then moved into it when synchronous speed is nearly reached |
1,283,435 |
Oct. 29, 1918 |
Sept. 19, 1918 |
Self-Starting Synchronous Motor |
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1,430,867 |
Oct. 3, 1922 |
Sept. 1, 1920 |
Lubricating system |
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1,456,082 |
May 22, 1923 |
Sept. 1, 1920 |
Motor Drive |
Type B motor (patent has same drawing as #1,430,867 |
1,495,936 |
May 27, 1924 |
April 12, 1922 |
Motor Drive |
Improvements in type B rotor, especially regarding the lubrication system |
Power Outage Indicator Patents |
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Patent Number |
Issue Date |
Filing Date |
Title |
Summary |
1.334.423 |
Mar. 23, 1920 |
Jan. 4, 1917 |
Indicator for Electrically Driven Clocks |
Basic idea for the standard power outage indicator. |
Master Clock Patents |
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Patent Number |
Issue Date |
Filing Date |
Title |
Summary |
1,502,493 |
July 22, 1924 |
April 15, 1918 |
Time Indicating Apparatus |
Type A Master Clock |
| 1,502,494 | July 22, 1924 | April 2, 1920 | Time Indicating Apparatus | Type B Master Clock |