Off-peak water heater control

• US 2,238,624 A
• Filed: 01/12/1939
• Issued: 04/15/1941
• Est. Priority Date: 01/12/1939
• Status: Expired due to Term

• Current Assignee: Earl K. Clark
• Original Assignee: Earl K. Clark
• Inventors: Clark, Earl K.
• Application Number:
  US02/250,559
• Time in Patent Office: 824 Days
• US Class Current: 392/464
• CPC Class Codes: G05D 23/1923 using thermal energy, the cost of which varies in function of time
• CPC Class Codes: G05D 23/275 with sensing element expanding, contracting, or fusing in response to changes of temperature

Claims