US3247703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic zeroing system
Assignee: Phillips Petroleum Co
•
Filing: 1963-05-20
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Granted: 1966-04-26
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Expires: 1983-05-20
Abstract
No abstract record available.
Inventors
- 👤 Marvin C Burk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:03
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/86; G01N30/8624; G01N30/88; G01N2030/8804
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
102 words
APPARATUS COMPRISING A CHROMATOGRAPHIC COLUMN HAVING AN INLET AND AN OUTLET; MEANS FOR PROVIDING A SAMPLE TO SAID INLET; AN ELECTRICAL NETWORK HAVING AN ELEMENT DISPOSED IN A PORTION OF SAID COLUMN OUTLET AND ALSO HAVING AN OUTPUT TERMINAL AND A BIASING TERMINAL, MEANS FOR BALANCING SAID NETWORK BY RECEIVING A SIGNAL REPRESENTATIVE OF NETWORK UNBALANCED AND PRODUCING THEREFROM A NETWORK-BIASING SIGNAL TO OPPOSITE POLARITY AND OF SUBSTANTIALLY EQUAL MAGNITUDE TO THE NETWORK UNBALANCE, MEANS FOR INTERMITTENTLY APPLYING THE SIGNAL REPRESENTATIVE OF NETWORK UNBALANCE TO SAID MEANS FOR BALANCING; AND MEANS FOR CONTINUOUSLY APPLYING THE NETWORK BIASING SIGNAL TO SAID BIASING TERMINAL.
References Cited (Backward Citations)
US2565230A
Cited
US2715209A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |