US2837007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential refractometer cell
Assignee: Phillips Petroleum Co
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Filing: 1953-05-28
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Granted: 1958-06-03
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Expires: 1973-05-28
Abstract
No abstract record available.
Inventors
- 👤 Francis W Crawford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:02
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/41; G01N21/4133
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
162 words
A REFRACTOMETER CELL COMPRISING AN OPAQUE BODY HAVING SUBSTANTIALLY THE SHAPE OF A RECTANGULAR PARALLELEPIPED AND DIVIDED INTO TWO HALVES ALONG A PLANE PERPENDICULAR TO ONE PAIR PF PARALLEL FACES OF THE PARALLELEPIPED AND ANGULARLY DISPOSED WITH RESPECT TO THE OTHER FOUR FACES THEREOF AT AN ANGLE DIFFERING FROM NINETY DEGREES AND EXTENDING FROM THE EXTERIOR OF ONE OF SAID OTHER FOUR FACES NEAR ONE EDGE THEREOF ALL THE WAY TO THE EXTERIOR OF THE OPPOSITE FACE, NEAR THE DIAGONALLY OPPOSITE EDGE, A PLATE OF TRANSPARENT MNATERIAL DISPOSED BETWEEN SAID HALVES. EACH OF SAID BODY HALVES HAVING A HOLE EXTENDING THERETHROUGH TERMINATING AT ONE END AT SAID PLATE AND AT THE OPPOSITE END ON ONE OF ANOTHER PAIR OF PARALLEL FACES OF SAID PARALLELEPIPED, AND TRANSPARENT MEANS CLOSING THE OUTER ENDS OF SAID HOLES, THE LAST SAID MEANS AND SAID HOLES, AND SAID PLATE PROVIDING A LIGHT PASSAGE THROUGH SAID CELL PARALLEL TO SAID FACES TO WHICH THE DIVIDING PLANE IS PERPENDICULAR.
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) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |