Patent US3612697A successfully refreshed from Google Patents.
US3612697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential refractometer cell
Assignee: Jenoptik AG
•
Filing: 1969-06-06
•
Granted: 1971-10-12
•
Expires: 1989-06-06
Abstract
Abstract A differential cell includes at least one stepped partition. The partition wall is transparent, and the windows of the cell may be Fresnel lenses.
Inventors
- 👤 Wolfgang Nebe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:34
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/41; G01N21/4133
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
A differential refractometer cell for measuring concentrations of liquids or gases, comprising at least two sealed chambers with respective inlet and outlet means connected to each chamber, a transparent partition separating said two chambers, said transparent partition having a plurality of steps, first and second windows, one window in each of said chambers aligned to permit a light beam of parallel rays to pass along an axis through the first window into the first chamber and through the transparent partition into the second chamber and subsequently out of the cell via the second window, each step of the stepped partition having two optically active faces and two optically inactive faces, said active faces being parallel to one another and at an angle to the rays and said axis and in optical alignment for parallel displacement of the rays.
Claim 2
Dependent Claim
138 words
A differential refractometer cell for measuring concentrations of liquids or gases, comprising at least two sealed chambers with respective inlet and outlet means connected to each chamber, a transparent partition separating said two chambers, said transparent partition having a plurality of steps, first and second windows, one window in each of said chambers aligned to permit a light beam of parallel rays to pass along an axis through the first window into the first chamber and through the transparent partition into the second chamber and subsequently out of the cell via the second window, each step of the stepped partition having two optically active faces and two optically inactive faces, said active faces being parallel to one another and at an angle to the rays and said axis and in optical alignment for parallel displacement of the rays.
Claim 3
Dependent Claim
21 words
A cell as claimed in claim 1, wherein said optically inactive faces are positioned substantially at right angles to said windows.
Claim 4
Dependent Claim
18 words
A cell as claimed in claim 2, wherein at least one of said windows in a Fresnel lens.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |