Patent US4011865A successfully refreshed from Google Patents.
US4011865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust-proof protection mask of face covering type
Assignee: Individual
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Filing: 1975-09-26
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Granted: 1977-03-15
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Expires: 1995-09-26
Abstract
Abstract A pair of small-sized air blowers or air blowing means, one being driven by means of an electric motor and the other being manually operated, are respectively connected to one end of two air inlet pipes each of which are selectively switched into operation by means of a three-way valve for providing flow and open feeding of air under pressure into a face covering type mask. An air inlet filter is mounted, as may be required, on the entrance side of the three-way valve. At least, one viewing window is provided on the front surface of the mask body. A transparent guard glass (and a colored, transparent light shielding glass for welding, as may be required) with suitable clearances for allowing the blowing-off of air therearound are oppositely fitted inside a viewing window. In addition, numerous small clearances are formed circumferentially between the inner side peripheral edge of the mask body and the face of a user to provide for air leak-off.
Inventors
- 👤 Mitsu Morishita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:08
CPC Classifications
A; A62; A62B; A62B18/00; A41; A41D; A41D13/00; A41D13/05; A41D13/11; A41D13/1107; A41D13/1161
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
341 words
A dust-proof protective mask comprising a mask body adapted to fit onto a wearer's face, said mask body having an air inlet opening, a first air inlet pipe connected to said air inlet opening, an electrically driven air blower on said first air inlet pipe for feeding air under pressure to said air inlet opening, an air filter on said first air inlet pipe, a second air inlet pipe connected to said first air inlet pipe, a manually-operated air blower means mounted on said second inlet pipe and operably mounted in parallel with said electrically driven air blower, said first and second air inlet pipes each having lower ends, a three-way valve to which said lower ends of said first and second air inlet pipes are connected for selectively switching flow of atmospheric air to said first or second air inlet pipes, said mask body having a peripheral edge, clearance means on said peripheral edge for leaking out air from between said clearance means and the user's face, said mask body having a viewing opening, a transparent viewing member, means mounting said transparent viewing member in said viewing opening to provide a clearance space between said transparent viewing member and said viewing opening for allowing air on the inside of the mask to blow out through said clearance space, a colored transparent welding light shielding member mounted on the inside of said transparent viewing member, said shielding member having a height less than the height of said transparent viewing member, said shielding member having an upper edge disposed above the level of the user's eyes, said shielding member being effective to shut off harmful rays of ultra-violet, infrared rays and the like from the user's eyes, said transparent viewing member having an upper portion extending above an upper edge of said shielding member and disposed between said upper edge of said shielding member and the upper edge of said viewing opening, whereby the wearer of the mask may freely see the outside through said upper portion of said transparent viewing member.
Claim 2
Dependent Claim
341 words
A dust-proof protective mask comprising a mask body adapted to fit onto a wearer's face, said mask body having an air inlet opening, a first air inlet pipe connected to said air inlet opening, an electrically driven air blower on said first air inlet pipe for feeding air under pressure to said air inlet opening, an air filter on said first air inlet pipe, a second air inlet pipe connected to said first air inlet pipe, a manually-operated air blower means mounted on said second inlet pipe and operably mounted in parallel with said electrically driven air blower, said first and second air inlet pipes each having lower ends, a three-way valve to which said lower ends of said first and second air inlet pipes are connected for selectively switching flow of atmospheric air to said first or second air inlet pipes, said mask body having a peripheral edge, clearance means on said peripheral edge for leaking out air from between said clearance means and the user's face, said mask body having a viewing opening, a transparent viewing member, means mounting said transparent viewing member in said viewing opening to provide a clearance space between said transparent viewing member and said viewing opening for allowing air on the inside of the mask to blow out through said clearance space, a colored transparent welding light shielding member mounted on the inside of said transparent viewing member, said shielding member having a height less than the height of said transparent viewing member, said shielding member having an upper edge disposed above the level of the user's eyes, said shielding member being effective to shut off harmful rays of ultra-violet, infrared rays and the like from the user's eyes, said transparent viewing member having an upper portion extending above an upper edge of said shielding member and disposed between said upper edge of said shielding member and the upper edge of said viewing opening, whereby the wearer of the mask may freely see the outside through said upper portion of said transparent viewing member.
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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) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |