The burner includes a pot 21 having air inlet apertures 21'
and supported in the casing 13 by ring 14. A firebox ring
10 supports a ring 11 to which the casing 13 is secured. A
motor-driven blower 46 is mounted in the bottom of the

9

Findings of Fact

casing. A central air distributor 26 is provided with air
outlet apertures 27 and 28, and is provided with a flame
spreader 29 adjacent to the flame ring 52. A flame spreader
having a downwardly turned periphery is illustrated in
figure 5 of the De Lancey patent drawings. The De Lancey
patent does not disclose the construction of the firebox for
the power-operated burner but does mention that the burner
could be used under hot-water heaters or in cook stoves. The
examiner did not reject the claims here in suit on the De
Lancey disclosure.

30. Bock patent 1,950,161 was also cited by the patent ex-
aminer. Bock shows an oil burner positioned in a furnace
firebox by a horizontal draft tube extending to a motor-driven
blower. The burner construction is illustrated in the follow-
ing reproduction of figure 2 of the Bock patent drawings.

Findings of Fact

140 C. Cls.

Referring to the drawing, the burner comprises a body 5 supported by draft tube 6 and having a cylindrical outer wall 7. The fire pot 9 is suspended from the flange 8 and is spaced from the outer wall 7. The pot 9 is provided with a plurality of openings or holes 22 for supplying secondary air to the combustion chamber. A central stack 12 extends upwardly in the combustion chamber and is provided with a flame spreader 13. A choke ring 18 of refractory material is supported at the upper end of fire pot 9. A loose layer of refractory material 25 within a refractory lining 17 at the bottom of the fire pot 9 is said to contribute toward producing a full round flame. Primary air is fed through holes 26 adjacent the refractory layer 25.

31. Young patent 2,219,276 was not cited by the patent examiner. Young discloses an oil-burning furnace for domestic use. The construction is illustrated by six sheets of drawings. The following reproduction of figure 5 of the patent drawings is adequate for discussion of the Young patent disclosure.

Findings of Fact

140 C. Cls.

Referring to the drawing, the burner 28 comprises a cylindrical portion 30 having a bottom cup 31. The cylindrical side wall 30 is provided with a series of small air holes not illustrated in figure 5. The burner 28 is secured to an annular plate 38, and the flange 39 of plate 38 is secured to the cylindrical wall 26 of the combustion chamber. A cylindrical member 52 is supported between the burner wall 30 and the combustion space wall 26 to prevent products of combustion from entering the pot through the air holes mentioned above. A motor-driven blower 91 forces air upward along the outside of the combustion chamber wall 26, and also supplies air to the space below the burner bottom 31 by means of a series of equally spaced openings around the lower end of wall 26. Air below the bottom 31 flows through the space 50 to the air holes in the pot wall 30. During pilot or hold-fire operation, the blower 91 is idle. A ring 142, described as a primary ring, is supported in the pot 30 between the series of air holes mentioned. The Young patent does not disclose a central air duct for tertiary air.

32. Hayter patent 2,342,272 issued to plaintiff's predecesso in business and relates to a boiler construction. This patent issued after the '232 application was filed and was not cited against said application by the patent examiner. The construction disclosed in the Hayter patent is illustrated by the following reproduction of figure 2 of the patent drawings.