Patent US5331957A successfully refreshed from Google Patents.
US5331957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respirator for only filtering air inhaled
Assignee: Individual
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Filing: 1993-02-05
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Granted: 1994-07-26
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Expires: 2013-02-05
Abstract
Abstract A respirator for only filtering air inhaled, which comprises a nose-cover portion and mouth-cover portion for covering a person's nose and mouth respectively; both sides of the two portions have lugs to be fastened together using a strap; each of the two portions has an exhausting hole without filter; the exhausting hole can be closed with a valve flap, and the exhausting hole can exhaust air only. The nose-cover portion includes an exhausting hole, which is mounted around with two layers of plastic nets; the upper plastic net can be lifted up to insert a gauze or a similar filter, which can be clamped between the two layers so as to provide the function of filtering air inhaled only.
Inventors
- 👤 Chin-Chia Liu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:11
CPC Classifications
A; A41; A41D; A41D13/00; A41D13/05; A41D13/11; A41D13/1107; A41D13/1138; A41D13/1146; A62; A62B; A62B18/00; A62B18/08; A62B18/10; A62B23/00; A62B23/02; A62B23/025
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
131 words
A respirator for only filtering air inhaled comprising a nose-cover portion and a mouth-cover portion, each of said portions having a lug at each side, a strap, said strap passing through each of said lugs to fasten said portions together to form a single mask; both said nose-cover portion and said mouth-cover portion having identical exhausting holes, and each said exhausting hole having a valve flap which serves as a check valve to prevent inhalation through the exhausting hole; said mouth-cover portion being made of an airtight material; said nose-cover portion including an upper and lower layer of plastic net; said upper layer of plastic net being liftable to facilitate the clamping of a filter, such as gauze, between said two layers so as to filter air inhaled through the nose.
Claim 2
Dependent Claim
131 words
A respirator for only filtering air inhaled comprising a nose-cover portion and a mouth-cover portion, each of said portions having a lug at each side, a strap, said strap passing through each of said lugs to fasten said portions together to form a single mask; both said nose-cover portion and said mouth-cover portion having identical exhausting holes, and each said exhausting hole having a valve flap which serves as a check valve to prevent inhalation through the exhausting hole; said mouth-cover portion being made of an airtight material; said nose-cover portion including an upper and lower layer of plastic net; said upper layer of plastic net being liftable to facilitate the clamping of a filter, such as gauze, between said two layers so as to filter air inhaled through the nose.
Claim 3
Dependent Claim
40 words
A respirator for only filtering air inhaled as claimed in claim 1, wherein said exhausting holes and said valve flaps are each furnished with an oval-shaped groove and an oval-shaped flange respectively, to engage each other in an airtight manner.
Claim 4
Dependent Claim
40 words
A respirator for only filtering air inhaled as claimed in claim 1, wherein said exhausting holes and said valve flaps are each furnished with a round groove and a round flange respectively, to engage each other in an airtight manner.
Claim 5
Dependent Claim
32 words
A respirator for only filtering air inhaled as claimed in claim 1, wherein said mouth-cover portion includes a thin corrugated plastic edge portion to provide an airtight contact with a user's face.
References Cited (Backward Citations)
US216171A
Cited
US2070241A
Cited
US2216619A
Cited
US2894508A
Cited
US3521630A
Cited
US4981138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-25 | 1998-01-24 | 1998-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-25 | 2002-01-24 | 2002-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-25 | 2006-01-24 | 2006-07-26 | $7700.00 | Window Closed / Lapsed |