1989148

Information

• Patent Grant
• 1989148

• References
• Source

• Patent Number

  1,989,148

• Date Filed

  Not available

• Date Issued

  Tuesday, January 29, 1935
  89 years ago

• CPC

  • G05D3/00 - Control of position or direction
  • E05F15/665 - for vertically-sliding wings
  • E05Y2900/104 - for elevators
  • G05B2219/43029 - Acceleration larger than deceleration for safe stopping at slow speed
  • G05B2219/43079 - Acceleration, deceleration controlled by switches along path
  • G05B2219/45242 - Door, panel, window operation, opening, closing

• US Classifications

  • 187 - Elevator, industrial lift truck, or stationary lift for vehicle
  • 049 - Movable or removable closures
  • 318 - Electricity: motive power systems