Gas separation: apparatus – Solid sorbent apparatus – With indicating means
Reexamination Certificate
1999-09-17
2001-10-02
Spitzer, Robert H. (Department: 1724)
Gas separation: apparatus
Solid sorbent apparatus
With indicating means
C096S132000, C096S135000, C096S142000, C096S153000, C096S223000, C096S226000
Reexamination Certificate
active
06296693
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to the field of disaster survival equipment and, in particular, to a filtration unit, and self contained life cell utilizing the same, that filters contaminated air entering a room in the event of a disaster.
BACKGROUND OF THE INVENTION
In spite of a large amount of misinformation which has been presented to the public, there is convincing scientific and technical information available that it is possible for most people to survive a full scale exchange of nuclear, biological or chemical weapons, or disaster caused by an industrial accident provided that proper advance preparations are made.
It is acknowledged that there would be little incentive for an individual to survive such a nuclear holocaust or biological disaster if, as a result, all life on earth were doomed to extinction or marginal existence. However, the National Academy of Sciences (NAS) has produced extensive reports on the atmospheric effects from various war scenarios, which contradict any such idea. In reality, therefore, the question today is not whether persons can survive a nuclear, biological. and chemical warfare or disaster agents, but whether people have the will and determination to prepare for survival.
A number of underground disaster shelters have been developed in preparation of such a disaster. The typical backyard, or personal, shelter has the capability of providing shelter for a small number of people, such as a family unit and incorporates features to protect its occupants against some of the effects of nuclear weapons. However, these shelters have a number of drawbacks. First, the shelter must be placed within the ground and, therefore, cannot be used by people who live in apartments or condominiums. Second, these shelters require leaving ones home in order to access the shelter, one is exposed to hazards from breathing in contaminated air while walking to the shelter. Further, biological contaminants in vapor may enter the body via membrane in the eye, or openings in the skin, and may attach to clothing and therefore infect all inhabitants of the shelter within hours. Finally. the cost of such shelters is relatively high and, therefore, the purchase of such a shelter is beyond the means of many people.
Given the inappropriateness of shelters in all situations, an alternative means of survival is necessary. In cases of nuclear disasters, survival means other than an underground shelter will most likely be ineffective if the occupants are in proximity of the blast zone. However, in cases where people are outside of the blast zone, but within the fallout zone, or in cases of biological or chemical disaster, the primary need is for a means of insuring that the air is free of these contaminants.
A number of air purification systems have been designed to filter the air in a room in order to remove contaminants from breathable air. For example, U.S. Pat. No. 5,207,877 issued May 3, 1993, describes a method for the purification of air in which air polluted with potentially harmful chemical and biological matter is purified and pollutants degraded to less hazardous substances by a combined chemical and electrical process.
Although this invention purifies and destroys most potentially harmful airborne chemicals, microorganisms and other biologicals both chemical and electrochemical means, it has a number of drawbacks. First, the system does filter harmful nuclear fallout, and therefore is ineffective in the event of a nuclear disaster. Second, it directed at purifying the air in a room where a known contaminant is found and therefore, neither filters incoming air nor maintains a closed environment to prevent outside air from entering a room. Third, the electrochemical reaction utilized by this system relies on available ions and bondable compounds to attract the hazardous and undesirable contaminants. Accordingly, this method will eventually cease to function properly due to the lack of available bondable ions and compounds. In such an event, the filtration system will not function properly unless the used chemicals are removed and fresh chemical replenished. Finally, the need to remove and replenish chemicals creates another potential hazard for the average person due to the risk of accidents during handling and storage of the spent and unspent chemical. For these reasons this method of air purification is not suitable for use in protecting from nuclear, biological and chemical disasters.
U.S. Pat. No. 4,337,071 issued Jun. 29, 1982 describes an on-site apparatus that produces cryogenic temperatures used to remove, by condensations all pollutants in the air so that an ultra clean air supply is obtained for human consumption in the interior of living enclosures, such as automobiles, homes, offices, hospitals etc. The apparatus can recycle air in the enclosure, i.e. resupply the oxygen consumed by the human being and remove the carbon dioxide produced by respiration. Cold traps (filters) of different cryogenic temperatures are built into the system to condense the pollutants of different condensation temperatures. The condensed pollutants can be disposed of by periodical defrost and purge of the system.
Although this system would allow a sealed room to maintain breathable atmosphere, it also has a number of drawbacks. First, this system does not contain a filter capable of removing nuclear fallout, biological hazards and dangerous chemicals from the air. Second, this system maintains a closed environment by recycling air, the system does not accomplish the decontamination process which is crucial for maintaining a safe environment in the event of a full scale exchange of nuclear, biological or chemical weapons, or disaster caused by an industrial accident. Third, the large amount of power required to maintain the temperatures required by these systems cannot be supplied for long by existing battery systems. Therefore, such a system will be ineffective in circumstances where power is out. U.S. Pat. No. 5,626,820 issued May 6, 1997 describes a clean room air-filtering device. This device features a clean room and chemical air filter suitable for use in the air handling system of the clean room directly upstream of high-efficiency particulate air (HEPA) filters. This device includes a HEPA filter (high efficiency particulate air filter), in addition to chemical filters targeted for the removal of the specific contaminants contained in the various air streams inside a clean room. The clean room air filter is designed to remove chemicals and other gas-phase contaminants created from within the clean room itself during the regular activities occurring in the manufacture of semiconductor devices. In addition, this device includes a processing station that generates a gas-phase contaminant in which the activated carbon particles are preferably selected to remove contaminant produced by the processing station.
This system is also ill suited for use in disaster situations. First, this air handling system preferably includes a make-up air system for drawing air from an atmosphere outside of the clean room, and is subject to contamination by an ambient contaminant. As this make-up air is made to air is passed through borosilicate filter material, rather than more efficient HEPA and/or charcoal filters, this make-up air may act to contaminate the interior air. Second, as this filter is directed to preventing dust and other airborne contaminants from interfering with manufacturing operations, it is not suited for the protection of humans from nuclear fallout, chemical or biological disasters that occur outside the processing station. Finally, this system does not include any means of determining whether contaminants are present within the air entering the system and, therefore, would need to be continuously employed to be effective.
U.S. Pat. No. 5,399,319 issued Mar. 21, 1995 describes a portable, convertible apparatus for creating either a negative pressure or a positive pressure in and filtering the air in a room. Within the airflow path, HEPA filter is locat
Cook Randolph H.
Lawson, Philpot & Persson
Persson Michael J.
Spitzer Robert H.
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