US3564900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
End-point analyzer
Assignee: Shell USA Inc
•
Filing: 1968-04-10
•
Granted: 1971-02-23
•
Expires: 1988-04-10
Abstract
Abstract A METHOD AND APPARATUS FOR QUICKLY DETERMINING THE END-POINT OF A DISTILLATION PROCESS BY RAPIDLY HEATING A VERY SMALL SAMPLE OF THE LIQUID TO BE DISTILLED, MEASURING THE SAMPLE TEMPERATURE WITH THERMOCOUPLES, FINDING THE SECOND DERIVATIVE OF THE THERMOCOUPLE OUTPUTS, AND DETECTING A PREDETERMINED VOLTAGE LEVEL IN THE SECONDDERIVATIVE SIGNAL.
Inventors
- 👤 Marshall L Andre
- 👤 William A Riggs
- 👤 Charles R Orr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:25
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |