US2731877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
clamann
Assignee: —
•
Filing: —
•
Granted: 1956-01-24
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Expires: 1973-01-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:13
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/41; G01N21/4133; Y; Y10; Y10S; Y10S55/00; Y10S55/34; Y10S73/00; Y10S73/11
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
162 words
A FAST AND CONTINUOUS ACTING PNEUMATIC REFRACTOMETER COMPRISING AN ANALYZING CELL, MEANS TO DIRECT A REFERENCE FLUID AND AN UNKNOWN FLUID IN CONTACT THROUGH SAID CELL IN LAMINAR FLOW WITHOUT SUBSTANTIAL INTERMIXING OF THE TWO FLUIDS, SAID FLUIDS BEING A DIFFERENT CHEMICAL COMPOSITION, MEANS TO DIRECT A BEAM OF LIGHT ACROSS SAID CELL TRANSVERSELY TO THE FLOW OF AND THROUGH SAID FLUIDS, SAID LAMINAR FLOW BEING SUCH THAT A CENTRAL LAYER OF UNKNOWN FLUID HAS A LAYER OF REFERENCE FLUID ON EITHER SIDE OF IT WHEREBY A PORTION OF THE LIGHT WILL PASS THROUGH REFERENCE AND UNKNOWN FLUID AND ANOTHER PORTION OF THE LIGHT WILL PASS THROUGH REFERENCE FLUID ONLY, SO IT IS POSSIBLE TO SEPARATELY ANALYZE AND COMPARE THE REFRACTED LIGHT FROM SAID UNKNOWN FLUID WITH THE REFRACTED LIGHT FROM SAID REFERENCE FLUID IN SUCH A MANNER THAT THE COMPOSITION OF THE UNKNOWN FLUID IS QUANTITATIVELY INDICATED AND WHEREIN VARIATIONS OF LIGHT INTENSITY OF SAID BEAM OF LIGHT ARE AUTOMATICALLY COMPENSATED.
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) | 1959-01-23 | 1959-07-25 | 1960-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-23 | 1963-07-25 | 1964-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-23 | 1967-07-25 | 1968-01-24 | $7700.00 | Window Closed / Lapsed |