US3789839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Covering for protecting head and face from dangerous aerosols and gases
Assignee: Civilforsvarsstyrelsen
•
Filing: 1972-06-27
•
Granted: 1974-02-05
•
Expires: 1992-06-27
Abstract
Abstract A protective hood adapted to surround the head of a person in order to protect him against contact with and inhalation of aerosols and gases and other dangerous substances, the hood consisting of a bag-shaped member made of plastic foil, preferably transparent plastic foil, in which an opening is provided and closed by an inhalation filter, a shrouding member being provided and adapted to surround the hood and press it into contact with the surface of the head of the user, so that the dead space in the hood is decreased, said shrouding member preferably consisting of a hood-shaped, elastic net.
Inventors
- 👤 B Lund
- 👤 F Lund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:29
CPC Classifications
A; A62; A62B; A62B17/00; A62B17/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A covering for protecting the head and face against toxic substances dispersed in the air, which comprises a hood made of flexible, gas-proof material and disposed to encompass the head and neck of the wearer, seal means on said hood operable to circumferentially engage the neck of the wearer to seal the hood thereto and thereby prevent entry of toxified air into the volume enclosed by the hood, air filter means connected to said hood for support thereby and operable to filter and detoxify air passing from outside the hood to the inside thereof for breathing by the wearer, and an elastic net shroud disposed in surrounding relation to said hood and for contact with the exterior surface thereof to press said hood against the wearer and thereby minimize the open volume enclosed by the hood, said elastic net shroud extending from said seal means over substantially the entire area of the hood covering the neck and head of the wearer.
Claim 2
Dependent Claim
161 words
A covering for protecting the head and face against toxic substances dispersed in the air, which comprises a hood made of flexible, gas-proof material and disposed to encompass the head and neck of the wearer, seal means on said hood operable to circumferentially engage the neck of the wearer to seal the hood thereto and thereby prevent entry of toxified air into the volume enclosed by the hood, air filter means connected to said hood for support thereby and operable to filter and detoxify air passing from outside the hood to the inside thereof for breathing by the wearer, and an elastic net shroud disposed in surrounding relation to said hood and for contact with the exterior surface thereof to press said hood against the wearer and thereby minimize the open volume enclosed by the hood, said elastic net shroud extending from said seal means over substantially the entire area of the hood covering the neck and head of the wearer.
Claim 3
Dependent Claim
15 words
A covering according to claim 1 wherein said hood is made of transparent plastic foil.
Claim 4
Dependent Claim
17 words
A covering according to claim 1 wherein said elastic net shroud is made of knitted textile material.
Claim 5
Dependent Claim
21 words
A covering according to claim 1 wherein said air filter means includes a frame connected in sealing relation to said hood.
Claim 6
Dependent Claim
41 words
A covering according to claim 4 wherein said frame has two sections disposed at an angle with respect to each other along an axis of intersection positioned to extend generally from the nose of the wearer down to the chin thereof.
References Cited (Backward Citations)
US521939A
Cited
US2821192A
Cited
US2432311A
Cited
US3033199A
Cited
US3327720A
Cited
US3521629A
Cited
US3621841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |