Patent US2768879A successfully refreshed from Google Patents.
US2768879A
Expired / Lapsed
US
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Apparatus for performing chemical tests
Assignee: Lessells and Associates Inc
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Filing: 1952-04-23
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Granted: 1956-10-30
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Expires: 1972-04-23
Abstract
No abstract record available.
Inventors
- 👤 Thomas A Hewson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:34
CPC Classifications
G; G01; G01N; G01N35/00; G01N35/02; G01N35/025; G01N2035/00346; G01N2035/00356; G01N2035/00366; G01N2035/00376; G01N2035/00445; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/18; Y10T74/18528
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
120 words
APPARATUS OF THE CLASS DESCRIBED, COMPRISING A BASE, A SHAFT MOUNTED VERTICALLY UPON SAID BASE, MEANS FOR DRIVING SAID SHAFT AT A SUBSTANTIALLY CONSTANT RATE, A PERFORATED PLATE MOUNTED AT THE UPPER END OF SAID SHAFT, A TUBULAR COLUMN MOUNTED ON SAID BASE AND SURROUNDING THE LOWER PORTION OF SAID SHAFT, A CARRIER SUPPORTED UPON SAID COLUMN FOR ROTATION ABOUT SAID SHAFT, A RECEPTACLE RECEIVER SECURED TO SAID CARRIER, A TORSION SPRING CONNECTED MECHANICALLY TO SAID SHAFT AND SAID CARRIER, A STOP MEMBER SECURED TO SAID CARRIER, AND A LATCH ACTUATED BY ROTATION OF THE SHAFT AND NORMALLY ENGAGING SAID STOP TO HOLD SAID CARRIER AGAINST ROTATION, DISENGAGEMENT OF THE LATCH AND STOP CAUSING SAID SPRING TO ROTATE THE CARRIER.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |