Patent US3753466A successfully refreshed from Google Patents.
US3753466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic fire extinguisher in electrophotographic copying machine or the like
Assignee: Fujifilm Business Innovation Corp
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Filing: 1971-12-02
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Granted: 1973-08-21
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Expires: 1991-12-02
Abstract
Abstract An automatic fire extinguishing device for use in an electrophotographic copying machine or the like having a heat treating section including inlet and outlet portions through which flammable material is passed and heat treated, the fire extinguishing device including means for detecting a fire in the heat treating section, a source of fire extinguishing gas, means responsive to the fire detecting means for releasing fire extinguishing gas upon detection of a fire, nozzle means connected to the source of fire extinguishing gas for spraying upon outbreak of a fire, the fire extinguishing gas in the form of a curtain so as to form an air curtain of the extinguishing gas at at least one of the inlet and outlet portions of the heat treating section to prevent the inflow of air therethrough, and an exhaust system responsive to the fire detecting means for sucking up the fire extinguishing gas after it has performed its function as an air curtain, so as to let it cover the source of the fire, and for discharging hot air in the heat treating section to the outside of the machine.
Inventors
- 👤 K Uematsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:59
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2007
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
203 words
An automatic fire extinguishing device for use in an electrophotographic copying machine or the like having a heat treating section including inlet and outlet portions through which flammable material is passed and heat treated, said fire extinguishing device comprising: means for detecting a fire in said heat treating section; a source of fire extinguishing gas; means responsive to said fire detecting means for releasing said fire extinguishing gas upon detection of a fire; nozzle means connected to said source of fire extinguishing gas for spraying upon outbreak of a fire, the fire extinguishing gas in the form of a curtain so as to form an air curtain of said extinguishing gas at at least one of said inlet and outlet portions of the heat treating section to prevent the inflow of air therethrough, at least two said nozzle means being located at each of said inlet and outlet portions respectively; and exhaust means responsive to said fire detecting means for sucking up the fire extinguishing gas after it has performed its function as an air curtain so as to let it cover the source of the fire, and for discharging hot air in the heat treating section to the outside of the machine.
Claim 2
Dependent Claim
203 words
An automatic fire extinguishing device for use in an electrophotographic copying machine or the like having a heat treating section including inlet and outlet portions through which flammable material is passed and heat treated, said fire extinguishing device comprising: means for detecting a fire in said heat treating section; a source of fire extinguishing gas; means responsive to said fire detecting means for releasing said fire extinguishing gas upon detection of a fire; nozzle means connected to said source of fire extinguishing gas for spraying upon outbreak of a fire, the fire extinguishing gas in the form of a curtain so as to form an air curtain of said extinguishing gas at at least one of said inlet and outlet portions of the heat treating section to prevent the inflow of air therethrough, at least two said nozzle means being located at each of said inlet and outlet portions respectively; and exhaust means responsive to said fire detecting means for sucking up the fire extinguishing gas after it has performed its function as an air curtain so as to let it cover the source of the fire, and for discharging hot air in the heat treating section to the outside of the machine.
Claim 3
Dependent Claim
206 words
An automatic fire extinguishing device for use in an electrophotographic copying machine or the like having a heat treating section including inlet and outlet portions through which flammable material is passed and heat treated, said fire extinguishing device comprising: means for detecting a fire in said heat treating section; a source of fire extinguishing gas; means responsive to said fire detecting means for releasing said fire extinguishing gas upon detection of a fire; nozzle means connected to said source of fire extinguishing gas for spraying upon outbreak of a fire, the fire extinguishing gas in the form of a curtain so as to form an air curtain of said extinguishing gas at at least one of said inlet and outlet portions of the heat treating section to prevent the inflow of air therethrough, a pair of said nozzle means being located on opposite sides of said flammable material to form said air curtain; and exhaust means responsive to said fire detecting means for sucking up the fire extinguishing gas after it has performed its fuNction as an air curtain so as to let it cover the source of the fire, and for discharging hot air in the heat treating section to the outside of the machine.
Claim 4
Dependent Claim
206 words
An automatic fire extinguishing device for use in an electrophotographic copying machine or the like having a heat treating section including inlet and outlet portions through which flammable material is passed and heat treated, said fire extinguishing device comprising: means for detecting a fire in said heat treating section; a source of fire extinguishing gas; means responsive to said fire detecting means for releasing said fire extinguishing gas upon detection of a fire; nozzle means connected to said source of fire extinguishing gas for spraying upon outbreak of a fire, the fire extinguishing gas in the form of a curtain so as to form an air curtain of said extinguishing gas at at least one of said inlet and outlet portions of the heat treating section to prevent the inflow of air therethrough, a pair of said nozzle means being located on opposite sides of said flammable material to form said air curtain; and exhaust means responsive to said fire detecting means for sucking up the fire extinguishing gas after it has performed its fuNction as an air curtain so as to let it cover the source of the fire, and for discharging hot air in the heat treating section to the outside of the machine.
Claim 5
Dependent Claim
237 words
An automatic fire extinguishing device for use in an electrophotographic copying machine or the like having a heat treating section including inlet and outlet portions through which flammable material is passed and heat treated, said fire extinguishing device comprising means for detecting a fire in said heat treating section; a source of fire extinguishing gas; means responsive to said fire detecting means for releasing said fire extinguishing gas upon detection of a fire; nozzle means connected to said source of fire extinguishing gas for spraying upon outbreak of a fire, the fire extinguishing gas in the form of a curtain so as to form an air curtain of said extinguishing gas at at least one of said inlet and outlet portions of the heat treating section to prevent the inflow of air therethrough, said nozzle means comprising an elongated tube having a slit disposed longitudinally therein, said tubes being oriented across the width of said flammable material to form said air curtain and a pair of plates disposed at the opposite sides of said slit to prevent turbulence of the sprayed fire extinguishing gas; and exhaust means responsive to said fire detecting means for sucking up the fire extinguishing gas after it has performed its function as an air curtain so as to let it cover the source of the fire, and for discharging hot air in the heat treating section to the outside of the machine.
Claim 6
Dependent Claim
237 words
An automatic fire extinguishing device for use in an electrophotographic copying machine or the like having a heat treating section including inlet and outlet portions through which flammable material is passed and heat treated, said fire extinguishing device comprising means for detecting a fire in said heat treating section; a source of fire extinguishing gas; means responsive to said fire detecting means for releasing said fire extinguishing gas upon detection of a fire; nozzle means connected to said source of fire extinguishing gas for spraying upon outbreak of a fire, the fire extinguishing gas in the form of a curtain so as to form an air curtain of said extinguishing gas at at least one of said inlet and outlet portions of the heat treating section to prevent the inflow of air therethrough, said nozzle means comprising an elongated tube having a slit disposed longitudinally therein, said tubes being oriented across the width of said flammable material to form said air curtain and a pair of plates disposed at the opposite sides of said slit to prevent turbulence of the sprayed fire extinguishing gas; and exhaust means responsive to said fire detecting means for sucking up the fire extinguishing gas after it has performed its function as an air curtain so as to let it cover the source of the fire, and for discharging hot air in the heat treating section to the outside of the machine.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |