Patent US4009647A successfully refreshed from Google Patents.
US4009647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clean air zone for surgical purposes
Assignee: Howorth Airtech Ltd
•
Filing: 1975-04-16
•
Granted: 1977-03-01
•
Expires: 1995-04-16
Abstract
Abstract Apparatus for providing a clean air zone around a patient undergoing surgery in the form of a plurality of air delivery means and air supply means for supplying sterile air to the air delivery means, a first central one of the air delivery means being adapted to supply air at a first velocity and a second outer one of the air supply means being adapted to supply air at a second lower velocity.
Inventors
- 👤 Frederick Hugh Howorth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:08
CPC Classifications
A; A61; A61G; A61G13/00; A61G13/10; A61G13/108; F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/068; Y; Y10; Y10S; Y10S55/00; Y10S55/29
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
Apparatus for providing a clean air zone around a patient undergoing surgery comprising: a plurality of air delivery means, a plurality of air supply means for supplying sterile air to the air delivery means, a first central one of the air delivery means being adapted to supply air at a first velocity, and a second outer one of the air supply means being adapted to supply air at a second velocity lower than the first velocity, the different air delivery means having different permeabilities for attaining the desired flow velocity differential.
Claim 2
Dependent Claim
91 words
Apparatus for providing a clean air zone around a patient undergoing surgery comprising: a plurality of air delivery means, a plurality of air supply means for supplying sterile air to the air delivery means, a first central one of the air delivery means being adapted to supply air at a first velocity, and a second outer one of the air supply means being adapted to supply air at a second velocity lower than the first velocity, the different air delivery means having different permeabilities for attaining the desired flow velocity differential.
Claim 3
Dependent Claim
101 words
Apparatus for providing a zone of sterile air around a patient undergoing surgery comprising: first and second and third adjacent air delivery means, each air delivery means being in the form of a rigid perforated panel having different permeabilities, a plurality of air supply means for supplying sterile air to the respective air delivery means, the first air delivery means being provided air at a first velocity, the second air delivery means being provided air at a second velocity lower than the first velocity, the third air delivery means being provided air at a third velocity lower than the second velocity.
Claim 4
Dependent Claim
101 words
Apparatus for providing a zone of sterile air around a patient undergoing surgery comprising: first and second and third adjacent air delivery means, each air delivery means being in the form of a rigid perforated panel having different permeabilities, a plurality of air supply means for supplying sterile air to the respective air delivery means, the first air delivery means being provided air at a first velocity, the second air delivery means being provided air at a second velocity lower than the first velocity, the third air delivery means being provided air at a third velocity lower than the second velocity.
References Cited (Backward Citations)
US3151929A
Cited
US3380369A
Cited
US3367257A
Cited
US3631788A
Cited
US3626837A
Cited
US3824909A
Cited
US3803995A
Cited
US3726204A
Cited
US3776121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |