Patent US3369984A successfully refreshed from Google Patents.
US3369984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus
Assignee: Dow Chemical Co
•
Filing: 1966-03-04
•
Granted: 1968-02-20
•
Expires: 1986-03-04
Abstract
No abstract record available.
Inventors
- 👤 Walter F Gerdes
- 👤 Hogan A Randle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:44
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; G; G01; G01N; G01N27/00; G01N27/60; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/034
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
APPARATUS FOR DETERMINING THE CHARGE CONDITION WHICH IS PRESENT IN FLOWABLE MATERIAL COMPRISING LIQUID AND PARTICLES, COMPRISING A FLOW PATH INCLUDING A CAPILLARY HAVING ELECTRICALLY INSULATING WALLS AND AN INPUT AND OUTPUT, MEANS FOR MEASURING SMALL ELECTRICAL POTENTIALS, A PAIR OF SPACED APART ELECTRODES, SAID ELECTRODES BEING DISPOSED IN SAID FLOW PATH AND ADAPTED TO CONTACT FLOWABLE MATERIAL TRAVELING ALONG SAID PATH AND SAID CAPILLARY BEING BETWEEN SAID ELECTRODES, TIMING MEANS COUPLED TO THE INPUT OF SAID FLOW PATH FOR SEQUENTIALLY FLOWING SAID MATERIAL AND THEN A DISPLACEMENT LIQUID ALONG SAID FLOW PATH, AND MEANS FOR COUPLING SAID MEANS FOR MEASURING SMALL ELECTRICAL POTENTIALS TO SAID ELECTRODES.
Claim 2
Dependent Claim
107 words
APPARATUS FOR DETERMINING THE CHARGE CONDITION WHICH IS PRESENT IN FLOWABLE MATERIAL COMPRISING LIQUID AND PARTICLES, COMPRISING A FLOW PATH INCLUDING A CAPILLARY HAVING ELECTRICALLY INSULATING WALLS AND AN INPUT AND OUTPUT, MEANS FOR MEASURING SMALL ELECTRICAL POTENTIALS, A PAIR OF SPACED APART ELECTRODES, SAID ELECTRODES BEING DISPOSED IN SAID FLOW PATH AND ADAPTED TO CONTACT FLOWABLE MATERIAL TRAVELING ALONG SAID PATH AND SAID CAPILLARY BEING BETWEEN SAID ELECTRODES, TIMING MEANS COUPLED TO THE INPUT OF SAID FLOW PATH FOR SEQUENTIALLY FLOWING SAID MATERIAL AND THEN A DISPLACEMENT LIQUID ALONG SAID FLOW PATH, AND MEANS FOR COUPLING SAID MEANS FOR MEASURING SMALL ELECTRICAL POTENTIALS TO SAID ELECTRODES.
References Cited (Backward Citations)
US2656508A
Cited
US3015775A
Cited
US2993846A
Cited
US3214354A
Cited
US3299354A
Cited
US3208919A
Cited
US3238128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |