Patent US3434335A successfully refreshed from Google Patents.
US3434335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for acoustically detecting minute particles suspended in a gaseous atmosphere
Assignee: National Science Foundation
•
Filing: 1966-07-29
•
Granted: 1969-03-25
•
Expires: 1986-07-29
Abstract
No abstract record available.
Inventors
- 👤 Gerhard Langer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:07
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/04; G01N29/045; G01N29/046; G01N29/02; G01N2291/00; G01N2291/02; G01N2291/021; G01N2291/0217; G01N2291/024; G01N2291/02408; G01N2291/028; G01N2291/02845
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A MINUTE PARTICLE DETECTING DEVICE COMPRISING: A HOLLOW TUBULAR MEANS OF A PREDETERMINED DIAMETER THROUGH WHICH A STREAM OF GASEOUS ATMOSPHERE CONTAINING MINUTE PARTICLES IS PASSED; AN ENTRANCE PORTION DISPOSED IN SAID HOLLOW TUBULAR MEANS THROUGH WHICH SAID GASEOUS ATMOSPHERE IS INTRODUCED INTO SAID HOLLOW TUBULAR MEANS; A CAPILLARY RESTRICTION PORTION DISPOSED IN SAID HOLLOW TUBULAR MEANS WHEREIN THE DIAMETER OF SAID CAPILLARY RESTRICTION PORTION IS SUBSTANTIALLY LESS THAN SAID PREDETERMINED DIAMETER; A LINEAR TAPERED FRUSTO-CONICAL TUBULAR PORTION DISPOSED IN SAID HOLLOW TUBULAR MEANS BETWEEN AND OPERATIVELY CONNECTING SAID ENTRANCE PORTION AND SAID CAPILLARY RESTRICTION PORTION WHEREBY SAID STREAM OF GASEOUS ATMOSPHERE IS PROVIDED WITH A SMOOTH TRANSITION FROM SAID ENTRANCE PORTION TO SAID CAPILLARY RESTRICTION PORTION PERMITTING LAMINAR FLOW TO BE MAINTAINED; AN EXIT PORTION IN SAID HOLLOW TUBULAR MEANS IMMEDIATELY ADJACENT THE END OF SAID CAPILLARY RESTRICTION PORTION;
Claim 2
Dependent Claim
140 words
A MINUTE PARTICLE DETECTING DEVICE COMPRISING: A HOLLOW TUBULAR MEANS OF A PREDETERMINED DIAMETER THROUGH WHICH A STREAM OF GASEOUS ATMOSPHERE CONTAINING MINUTE PARTICLES IS PASSED; AN ENTRANCE PORTION DISPOSED IN SAID HOLLOW TUBULAR MEANS THROUGH WHICH SAID GASEOUS ATMOSPHERE IS INTRODUCED INTO SAID HOLLOW TUBULAR MEANS; A CAPILLARY RESTRICTION PORTION DISPOSED IN SAID HOLLOW TUBULAR MEANS WHEREIN THE DIAMETER OF SAID CAPILLARY RESTRICTION PORTION IS SUBSTANTIALLY LESS THAN SAID PREDETERMINED DIAMETER; A LINEAR TAPERED FRUSTO-CONICAL TUBULAR PORTION DISPOSED IN SAID HOLLOW TUBULAR MEANS BETWEEN AND OPERATIVELY CONNECTING SAID ENTRANCE PORTION AND SAID CAPILLARY RESTRICTION PORTION WHEREBY SAID STREAM OF GASEOUS ATMOSPHERE IS PROVIDED WITH A SMOOTH TRANSITION FROM SAID ENTRANCE PORTION TO SAID CAPILLARY RESTRICTION PORTION PERMITTING LAMINAR FLOW TO BE MAINTAINED; AN EXIT PORTION IN SAID HOLLOW TUBULAR MEANS IMMEDIATELY ADJACENT THE END OF SAID CAPILLARY RESTRICTION PORTION;
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) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |