US3850171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical face masks
Assignee: Vickers Ltd
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Filing: 1973-05-16
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Granted: 1974-11-26
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Expires: 1993-05-16
Abstract
Abstract A medical face mask for supplying gas/air mixture to a patient comprising a hollow body portion adapted to cover the nose and mouth of the patient and an inlet portion for adjustably supplying said gas/air mixture. The body portion includes an inlet opening and at least one outlet. The inlet portion of the mask comprises a venturi throat in communication with the inlet opening in the body portion and includes first and second apertured members, said second member is mounted to the inlet portion and has a plurality of apertures and a gas inlet means. Said first member is rotatably mounted to said second member and has a plurality of apertures adapted for the selective registry with said apertures in said second member.
Inventors
- 👤 G Ball
- 👤 I Fehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:54
CPC Classifications
A; A62; A62B; A62B18/00; A61; A61M; A61M16/00; A61M16/06; A61M16/10; A61M16/12; A61M16/122; A61M16/125; A61M16/127
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
A medical face mask comprising a hollow body portion adapted to fit over the nose and mouth of a patient, said body portion having an inlet opening and at least one outlet opening, and an inlet portion including a venturi throat in communication with said inlet opening and having first and second apertured members, said second apertured member being fast with said inlet portion and including a plurality of apertured, said second aperture member including gas inlet means for introduction of a gas into said venturi throat, and said first apertured member being rotatably mounted to said second apertured member and including a plurality of apertures adapted for registry with selected apertures of said second member to permit selectable amounts of air into said venturi throat.
Claim 2
Dependent Claim
126 words
A medical face mask comprising a hollow body portion adapted to fit over the nose and mouth of a patient, said body portion having an inlet opening and at least one outlet opening, and an inlet portion including a venturi throat in communication with said inlet opening and having first and second apertured members, said second apertured member being fast with said inlet portion and including a plurality of apertured, said second aperture member including gas inlet means for introduction of a gas into said venturi throat, and said first apertured member being rotatably mounted to said second apertured member and including a plurality of apertures adapted for registry with selected apertures of said second member to permit selectable amounts of air into said venturi throat.
Claim 3
Dependent Claim
51 words
A medical face mask as set forth in claim 1 wherein said apertures in each of said first and second members are disposed on a common pitch circle, said circles each being coaxial about the axis of rotation of said first apertured member and of the same radius as the other.
Claim 4
Dependent Claim
40 words
A medical face mask as set forth in claim 1 wherein said first aperture member is rotatably mounted to said gas inlet means, and said gas inlet means including biasing means for biasing said first member against said second member.
Claim 5
Dependent Claim
61 words
A medical face mask as set forth in claim 1 wherein said second aperture member includes at least apertures A, B, C and D and first aperture member includes at least corresponding apertures a, b, c and d, each of said apertures having centers positioned on corresponding pitch circles of the same diameter and said centers being positioned about 60* apart.
Claim 6
Dependent Claim
42 words
A medical face mask as set forth in claim 4 wherein apertures b, c and d are each slightly larger than corresponding apertures B, C and D and where the diameters of said apertures are related as follows: A<B C<D and a<b<c<d.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |