Further Patents

Having succeeded with his 1914 patent No, 2,570, Frederick Grogan decided to attempt to have the same invention patented in several other countries. In December 1918, he submitted the same patent application in France (No. 419,317) and was again successful. The following year he submitted the same in Canada (No. CA217614), where again he met with success.

FR494317A
Electrical Heating Element

Patent No. 1451/32 – Improvements in Imitiation Fires 

It was a further ten years before he submitted his next patent application, this time in the UK for an invention entitled ‘Improvement in Imitation Fires’. The patent No. 1451/32, was submitted on 18th January 1932 and accepted on 12th January 1933. The imitation fire was constructed in such a way as “to present the appearance of coals or wood logs in a glowing or incandescent state”, which sounds like many imitation fires that are available today. In his specification, he detailed 6 claims for the invention:

  1. An imitation fire in which the fuel with the back and side cheeks are formed as an integral, removable and non-translucent unit the main portion or bed being moulded to represent lumps of coal or wood logs of irregular size and shape and appropriately tinted to simulate, when illuminated by one or more electric lamps reflecting light through holes in the fuel bed, a glowing fire with intervening parts representing dead fuel or ash, substantially as described.
  2. An imitation fire as claimed in claim 1 in which the lower front edge of the fuel unit is so formed as to provide a series of slots between the same and the base of the grate, for the purpose specified.
  3. An imitation fire as claimed in claims 1 and. 2 in which the electric lamp or lamps mounted below the fuel bed are shaded by a tinted translucent screen, for the purpose specified.
  4. An imitation fire as claimed in claims 1 to 3 in which one or more apertures in the base of the grate are masked by a tinted translucent screen for the purpose specified.
  5. An imitation fire as claimed in claims 1 to 4 in which one or more tinted electric lamps are disposed adjacent to the upper grate bar and screened thereby to produce a floodlighting effect on the upper surface of the fuel bed, substantially as described.
  6. An imitation fire constructed and having its parts combined and arranged substantially as hereinbefore described with reference to the accompanying drawings for the purposes specified.
Improvements in Imitiation Fires

Patent No. 15,430/32 – Improvements in Electric Heaters

Later the same year, Frederick Grogan submitted a further patent application, No. 15,430/32. This time entitled ‘Improvements in Electric Heaters’, it was submitted on 31st May and accepted eighteen months later, on 2nd November 1933.

This invention was all embracing and targeted at electric heaters used to heat “the interiors of buildings, such as public and private Institutions, Workshops, Banks, and Offices”. The key was that the heating elements enclosed within a tubular casing, could be of varying lengths and combinations and could be fixed to a wall, floor or ceiling. The application identified the following 4 claims:-

  1. In an electric heater of the kind described the provision of a gap in the wall of the tubular casing enclosing the heating element, said gap being so situated that the electric terminals are exposed on the withdrawal of a slidable tube normally covering said gap substantially as and for the purpose described.
  2. An electric heater as claimed in claim 1 in which the slidable tube is detachably secured to a removable cap, closing one end of the tubular casing and to the wall of the casing respectively.
  3. An electric heater as claimed in claims 1 and 2 in which the removable cap is provided with a central tapped hole for the purpose specified.
  4. An. electric heater casing constructed and having its parts arranged and combined substantially as hereinbefore described with reference to the accompanying drawings and for the purposes specified.
Improvements in Electrical Heaters

Patent No. 35149/36 – Improvements in Electric Furnaces and Ovens

In his last patent application No. 35149/36, submitted on 22nd December 1936 and approved on 30th June 1937, Frederick Grogan had turned his attention to electric furnaces and ovens and to an improved method of supporting heating elements, or more specifically the windings that the elements were comprised of, delivering a less expensive method of producing the refractory linings. This patent was particularly targeted at cylindrical electric furnaces.

The specification highlighted the following 6 claims:

  1. In electric furnaces and ovens, carrying the resistor windings on supports inserted in holes of greater diameter than the supports and extending through the refractory lining, and fixed in such holes by embedding the same in a refractory insulating cement of low heat conductivity.
  2. An electric furnace or oven as claimed in claim 1 in which the supports are formed of a refractory material.
  3. An electric furnace or oven as claimed in claim 1 in which the supports are made of metal or of an inert alloy.
  4. An electric furnace or oven in which each of the blocks of the refractory lining are provided, with holes of greater diameter than the tapered shanks of the pins which support and guide the resistor windings whereby the said shanks are fixed in said holes by embedding the same in a refractory insulating cement of low heat conductivity.
  5. An electric furnace as claimed in claim 4 in which the upper and lower rows of pins in each block are provided with heads and collars to position the resistor windings.
  6. An electric furnace or oven in which the resistor winding are carried on supports constructed and arranged substantially as hereinbefore described with reference to the accompanying drawings for the purpose specified.
Improvements in Electrical Furnaces and Ovens