Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
  • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
  • B01J21/08—Silica
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B17/00—Sulfur; Compounds thereof
  • C01B17/69—Sulfur trioxide; Sulfuric acid
  • C01B17/74—Preparation
  • C01B17/76—Preparation by contact processes
  • C01B17/78—Preparation by contact processes characterised by the catalyst used
  • C01B17/79—Preparation by contact processes characterised by the catalyst used containing vanadium
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
  • H01H73/36—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electromagnetic release and no other automatic release
  • H01H73/42—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electromagnetic release and no other automatic release reset by rotatable knob or wheel

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Inorganic Chemistry (AREA)
• Breakers (AREA)
• Switch Cases, Indication, And Locking (AREA)
• Details Of Connecting Devices For Male And Female Coupling (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=7738619

Family Applications (1)

Country Status (4)

Families Citing this family (1)

• 0
  • NL NL17036D patent/NL17036C/xx active
• 1925
  • 1925-05-28 GB GB14021/25A patent/GB238515A/en not_active Expired
  • 1925-05-29 FR FR598928D patent/FR598928A/en not_active Expired
  • 1925-06-12 US US36746A patent/US1662970A/en not_active Expired - Lifetime

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