Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
244 words
An air cleaning device comprising: a housing defining an air inlet opening, an air outlet opening, and a first air flow path formed between the inlet and outlet openings; a blower disposed in the housing and arranged to move air in the first air flow path from the inlet to the outlet; a multiple speed motor rotatably coupled to the blower; a blower control for varying the operational mode of the motor; an air filter disposed within the housing in the first air flow path; a filter change indicator that is operable in various orientations of the air cleaning device, comprising: a tubulation disposed with the housing and having a first and a second end, the tubulation defines a hollow center which forms an inclined passage that extends between the first end and the second end, the first end is in fluid communication with a second air flow path formed between the first end and second end, wherein the second air flow path is open to atmospheric pressure, and the second end is in fluid communication with the first air flow path inside the housing at a location downstream of the filter; a step formed at the first end of the tubulation; a moveable visual indicator retained within the hollow center; a viewing window disposed on the housing above the second end of the tubulation; and an air flow metering system formed in the housing for regulating the air flow rate through the tubulation.
Claim 2
Dependent Claim
244 words
An air cleaning device comprising: a housing defining an air inlet opening, an air outlet opening, and a first air flow path formed between the inlet and outlet openings; a blower disposed in the housing and arranged to move air in the first air flow path from the inlet to the outlet; a multiple speed motor rotatably coupled to the blower; a blower control for varying the operational mode of the motor; an air filter disposed within the housing in the first air flow path; a filter change indicator that is operable in various orientations of the air cleaning device, comprising: a tubulation disposed with the housing and having a first and a second end, the tubulation defines a hollow center which forms an inclined passage that extends between the first end and the second end, the first end is in fluid communication with a second air flow path formed between the first end and second end, wherein the second air flow path is open to atmospheric pressure, and the second end is in fluid communication with the first air flow path inside the housing at a location downstream of the filter; a step formed at the first end of the tubulation; a moveable visual indicator retained within the hollow center; a viewing window disposed on the housing above the second end of the tubulation; and an air flow metering system formed in the housing for regulating the air flow rate through the tubulation.
Claim 3
Dependent Claim
13 words
The filter change indicator defined in claim 1 wherein the tubulation is transparent.
Claim 4
Dependent Claim
15 words
The filter change indicator defined in claim 1 wherein the visible indicator is a float.
Claim 5
Dependent Claim
27 words
The filter change indicator defined in claim 1 wherein the housing defines an atmospheric opening which is in fluid communication with the first end of the tubulation.
Claim 6
Dependent Claim
59 words
The filter change indicator defined in claim 1 wherein the air flow metering system includes a selector switch that defines an aperture, the aperture being disposed adjacent an aperture defined by the housing such that the aperture defined by the selector switch can be moveably placed in either substantial or partial alignment with the aperture defined by the housing.
Claim 7
Dependent Claim
14 words
The air cleaning device defined in claim 1 wherein the device is a fan.
Claim 8
Dependent Claim
14 words
The air cleaning device defined in claim 1 wherein the device is a humidifier.
Claim 9
Dependent Claim
14 words
The air cleaning device defined in claim 1 wherein the device is a heater.
Claim 10
Dependent Claim
16 words
The air cleaning device defined in claim 1 wherein the device is an air conditioning apparatus.
Claim 11
Dependent Claim
15 words
The air cleaning device defined in claim 1 wherein the device is an air purifier.