Catalytic purification of exhaust gases

• US 2,937,490 A
• Filed: 08/12/1957
• Issued: 05/24/1960
• Est. Priority Date: 08/12/1957
• Status: Expired due to Term

• Current Assignee: Willard R. Calvert
• Original Assignee: Willard R. Calvert
• Inventors: Calvert, Willard R.
• Application Number:
  US03/677,618
• Time in Patent Office: 1,016 Days
• US Class Current: 60/274
• CPC Class Codes: F01N 13/14 having thermal insulation exhaust manifolds F01N13/102
• CPC Class Codes: F01N 2330/08 Granular material
• CPC Class Codes: F01N 2470/30 Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow
• CPC Class Codes: F01N 3/204 using an exhaust gas igniter, e.g. a spark or glow plug, without introducing fuel into exhaust duct
• CPC Class Codes: F01N 3/30 Arrangements for supply of additional air control, e.g. using by-passes or variable air pump drives, F01N3/22
• CPC Class Codes: F01N 3/34 using air conduits or jet air pumps, e.g. near the engine exhaust port
• CPC Class Codes: F01N 3/38 Arrangements for igniting
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Claims

1. A METHOD FOR AFFECTING RAPID ACTIVATION OF A CATALYTIC EXHAUST PURIFIER CONNECTED TO THE EXHAUST OUTLET FROM A SPARK-FIRED INTERNAL CONBUSTION ENGINE COMPRISING THE STEPS OF CAUSING THE ENGINE TO OPERATE INTERMITTENTLY BY INTERMITTENTLY INTERRUPTING THE NORMAL IGNITION TO THE ENGINE SPARK PLUGS, PASSING THE RAW UNOXIDIZED FUEL-AIR MIXTURE THEREBY EXHAUSTED FROM THE ENGINE CYLINDERS TO A CHAMBER ADJACENT TO AND UPSTREAM FROM A CATALYST BED, IGNITION AND BURNING SAID RAW FUEL-AIR MIXTURE IN SAID CHAMBER, THE RESULTING HOT COMBUSTION PRODUCTS BEING PUMPED BY THE ACTION OF SAID ENGINE THROUGH SAID CATALYST BED CAUSING RAPID HEATING THEREOF, AND DISCONTINUING SAID PROCEDURE WHEN AT LEAST THE INLET PORTION OF SAID CATALYST