Capacity level control with adjustable span control

• US 2,871,874 A
• Filed: 10/15/1954
• Issued: 02/03/1959
• Est. Priority Date: 10/15/1954
• Status: Expired due to Term

• Current Assignee: Frederick L. Maltby, Joseph W. Philippi, Ralph V. Coles
• Original Assignee: Frederick L. Maltby, Joseph W. Philippi, Ralph V. Coles
• Inventors: Coles, Ralph V., Maltby, Frederick L., Philippi, Joseph W.
• Application Number:
  US03/462,422
• Time in Patent Office: 1,572 Days
• US Class Current: 137/392
• CPC Class Codes: G01F 23/265 for discrete levels
• CPC Class Codes: G05D 9/12 characterised by the use of electric means
• CPC Class Codes: H01H 47/20 for producing frequency-selective operation of the relay
• CPC Class Codes: Y10T 137/7306 Electrical characteristic sensing
• CPC Class Codes: Y10T 137/7413 Level adjustment or selection means

Claims