2

Including apparatus purging, cleaning or accretion preventing

3

Including repairing, converting or assembling apparatus

4

Including apparatus heat-up, cool-down or protection

5

Including preparing or arranging work for heating

8

Continous strip, strand or web passed longitudinally through heating zone

9

Treating an article, container, batch or body as a unit

13

Including melting, vaporizing, sintering, expanding comminuting, or classifying work material

14

Including passing, treating or conveying gas into or through particulate work

18

Subjecting work to diverse treatments or graduated temperatures

19

Controlling flame position or work atmosphere

27

Including the flowing or circulating of particulate heat carrier

28

Of operating a furnace utilizing a heat storage mass

29

Of heating a fluid

31

Heating of or by wall or radiant surface

37

Analyzer or composition sensor of work, work atmosphere or exhaust gas

38

Control of or response to apparatus protecting fluid or means

39

Of selection or load balancing of furnace exhaust heated regenerators

40

Of hot blast stove (i.e., of Cowper stove)

41

Of purger, purge period, scavenger or cleaner

42

Of protective work shield, cooler or atmosphere; or of heat applicator position

43

Of discharging, or stopping the heating of a unit or batch on sensed completion of heating

45

Of or by means sensing or controlling work movement, quantity or position

46

Condition responsive shutdown requiring reset

47

Of or by pressure of fluid work or work chamber atmosphere

48

Of cooling, dilution, withdrawal, bypass or circulation of work chamber atmosphere

49

Of or by heat generation or transmission

52

Of handling or treatment of discrete work batch or unit

56

Door or baffle movement correlated with work movement or placement

57

Heating gas supply, removal or recirculation correlated with work or door movement or placement

60

Internally heated roll

63

Installed on internal combustion engine element

68

Separator discharges gas to work zone

69

With means passing separated solid to heating zone

70

At regenerator or recuperator (e.g., slag pocket, etc.)

78

Combustion feed air cools exiting work by contact

81

Work holder having selectively usable heating and cooling structure

82

Entering and leaving work exchange heat

83

Work heat removed through heat transmitting wall

85

Cooling liquid contacts work

91

Having means utilizing generated steam in heating work

96

Having combustion products generated in or fed to shaft

102

Having heat emitting tube or flue within or traversing shaft chamber

104

Having support for engaging heated surface of domestic stove

105

Having combustion products generated in or fed to drum

112

Externally heated drum or associated heating element heats work by conduction or radiation