US4700067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for checking atmospheric pollution due to alpha particle emitting aerosols
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1985-04-26
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Granted: 1987-10-13
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Expires: 2005-04-26
Abstract
Abstract Apparatus for checking atmospheric pollution by alpha particle-emitting aerosols includes a filter, a detector positioned facing the filter and a unique grid positioned between the filter and the detector. The grid is constituted by radial plates perpendicular to the filter and the detector extending over the entire distance between the latter and defining cells, each of which is open towards the outside of the space between the filter and the detector.
Inventors
- 👤 Jean-Claude Carossi
- 👤 David Da Costa Viera
- 👤 Claude Thirion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:57
CPC Classifications
G; G01; G01T; G01T7/00; G01T7/02; G01T7/04; Y; Y10; Y10S; Y10S250/00; Y10S250/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
109 words
An apparatus for checking atmospheric pollution due to alpha particle-emitting aerosols of the type comprising a flat filter for retaining the aerosols, a detector having a planar face positioned facing the filter and parallel thereto and a grid arranged between the filter and said planar face of the detector, wherein the grid comprises a plurality of plates arranged both radially and perpendicularly to the filter and to the planar face of the detector extending over the entire distance between the filter and said planar face and defining cells, each of which is open towards the outside of the space between the filter and said planar face of the detector.
Claim 2
Independent Claim
109 words
An apparatus for checking atmospheric pollution due to alpha particle-emitting aerosols of the type comprising a flat filter for retaining the aerosols, a detector having a planar face positioned facing the filter and parallel thereto and a grid arranged between the filter and said planar face of the detector, wherein the grid comprises a plurality of plates arranged both radially and perpendicularly to the filter and to the planar face of the detector extending over the entire distance between the filter and said planar face and defining cells, each of which is open towards the outside of the space between the filter and said planar face of the detector.
Claim 3
Dependent Claim
48 words
An apparatus according to claim 1, wherein the filter and the planar face of the detector are circular, thus defining a cylindrical space, and wherein the plates constituting the grid pass through the axis of said cylindrical space and form cells shaped like sectors open towards the outside.
References Cited (Backward Citations)
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US4385236A
Cited
US4442358A
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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) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |