Patent US4288544A successfully refreshed from Google Patents.
US4288544A
Expired / Lapsed
US
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Method and apparatus for measuring microorganism activity
Assignee: KH Neochem Co Ltd
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Filing: 1979-05-01
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Granted: 1981-09-08
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Expires: 1999-05-01
Abstract
Abstract The microbial activity in a liquid medium is determined by measuring the electric current values or potential values generated by the microorganisms. Also disclosed herein is apparatus for carrying out such measurement comprising two electrodes or two electrolytic electrode systems constructed and arranged to be immersed in a culture liquor.
Inventors
- 👤 Shuichi Suzuki
- 👤 Isao Karube
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:29
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/02; C12Q1/04; C12Q2304/00; C12Q2304/80
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
65 words
A method for determining the unknown number of living cells or total number of active parts in a liquid medium by measuring the difference between the current value or potential value of said microorganism and the current value or potential value of said liquid medium and correlating said measured difference with a current or potential difference which corresponds to a known amount of said microorganism.
Claim 2
Independent Claim
65 words
A method for determining the unknown number of living cells or total number of active parts in a liquid medium by measuring the difference between the current value or potential value of said microorganism and the current value or potential value of said liquid medium and correlating said measured difference with a current or potential difference which corresponds to a known amount of said microorganism.
Claim 3
Dependent Claim
61 words
A method according to claim 1 wherein said measurement is carried out by suspending in said liquid medium two electrode systems, each having a cathode, an internal electrolyte and a liquid junction and each having an exposed anode, one of said anodes being covered with a microorganism-impermeable membrane; and comparing the current value or potential value of said two electrode systems.
Claim 4
Dependent Claim
66 words
A method according to claim 1 wherein said measurement is carried out by suspending in said liquid medium two electrolytic electrode potentiostatic systems comprising two exposed electrodes and a reference calomel electrode, one of said electrolytic electrode systems having one of said exposed electrode (anode) being covered with a microorganism-impermeable membrane, and by comparing the current value or potential value of said two electrolytic electrode systems.
Claim 5
Dependent Claim
82 words
Apparatus for measuring microorganism activity in a liquid medium which comprises two electrode systems each of which comprises a cathode with an inside electrolyte having a liquid junction with said liquid medium and an exposed anode, wherein the exposed anode of one of said systems is covered with a microorganism-impermeable membrane for measuring activity of the microorganism on the outer side of said membrane; each of said cathodes and anodes being arranged in parallel and being connected to an ammeter or potentiometer.
Claim 6
Dependent Claim
82 words
Apparatus for measuring microorganism activity in a liquid medium which comprises two electrode systems each of which comprises a cathode with an inside electrolyte having a liquid junction with said liquid medium and an exposed anode, wherein the exposed anode of one of said systems is covered with a microorganism-impermeable membrane for measuring activity of the microorganism on the outer side of said membrane; each of said cathodes and anodes being arranged in parallel and being connected to an ammeter or potentiometer.
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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) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |