US2643940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractor for removing soluble constituents in chemical analysis
Assignee: United States Department of the Interior
•
Filing: 1951-09-14
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Granted: 1953-06-30
•
Expires: 1971-09-14
Abstract
No abstract record available.
Inventors
- 👤 Rollin E Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:34
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/508; B01L3/5082; G; G01; G01N; G01N25/00; G01N25/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A THERMALLY OPERATED EXTRACTOR WHICH COMPRISES A FIRST TUBE, SAID FIRST TUBE HAVING A TAPERED GROUND STOPPER SEAT LOCATED IN THE UPPER END THEREOF, A STOPPER FITTED IN SAID SEAT TO CLOSE THE UPPER END OF SAID FIRST TUBE, AN ANNULAR ENLARGEMENT LOCATED BELOW SAID STOPPER SEAT AND PROXIMATE THERETO, A POROUS FILTER HELD WITHIN THE LOWER END OF SAID FIRST TUBE AND OCCUPYING THE ENTIRE AREA WITHIN SAID LOWER END, AND A SECOND TUBE DISPOSED CONCENTRICALLY AROUND SAID FIRST TUBE, THE LOWER END OF SAID SECOND TUBE BEING CLOSED AND THE UPPER END OF SAID SECOND TUBE BEING OPEN AND IN NONGAS-TIGHT CONTACT WITH SAID ENLARGEMENT OF SAID FIRST TUBE, TO MAINTAIN SAID TUBES IN COAXIAL RELATIONSHIP.
Claim 2
Dependent Claim
118 words
A THERMALLY OPERATED EXTRACTOR WHICH COMPRISES A FIRST TUBE, SAID FIRST TUBE HAVING A TAPERED GROUND STOPPER SEAT LOCATED IN THE UPPER END THEREOF, A STOPPER FITTED IN SAID SEAT TO CLOSE THE UPPER END OF SAID FIRST TUBE, AN ANNULAR ENLARGEMENT LOCATED BELOW SAID STOPPER SEAT AND PROXIMATE THERETO, A POROUS FILTER HELD WITHIN THE LOWER END OF SAID FIRST TUBE AND OCCUPYING THE ENTIRE AREA WITHIN SAID LOWER END, AND A SECOND TUBE DISPOSED CONCENTRICALLY AROUND SAID FIRST TUBE, THE LOWER END OF SAID SECOND TUBE BEING CLOSED AND THE UPPER END OF SAID SECOND TUBE BEING OPEN AND IN NONGAS-TIGHT CONTACT WITH SAID ENLARGEMENT OF SAID FIRST TUBE, TO MAINTAIN SAID TUBES IN COAXIAL RELATIONSHIP.
References Cited (Backward Citations)
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US2485739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |