Patent US4502207A successfully refreshed from Google Patents.
US2881137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bacterial digestion of organic matter
Assignee: Dorr Oliver Inc
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Filing: 1954-07-01
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Granted: 1959-04-07
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Expires: 1974-07-01
Abstract
No abstract record available.
Inventors
- 👤 Robert P Logan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:00
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/28; C02F3/2866; C02F3/2873
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN ANAEROBIC DISGESTION OF BACTERIALLY DIGESTIBLE ORGANIC MATTER IN A SLUDGE DIGEST, THE METHOD OF CONTROLLING THE PH OF THE SLUDGE UNDERGOING DIGESTION WHICH COMPRISES THE STEPS OF SCRUBING DIGESTER GAS FROM SAID DIGESTER WITH AN ABSORBENT LIQUID ADAPTED TO ABSORB CARBON DIOXIDE AND MIXINGLY CONTACTING SAID SLUDGE UNDERGOING DIGESTION WITH SAID DIGESTER GAS THUS STRIPPED, SAID STRIPPED GAS BEING EFFECTIVE IN ABSORBING DISSOLVED CARBON DIOXIDE FROM THE SLUDGE TO AN EXTEND SUFFICIENT TO BRING THE PH OF THE SLUDGE TO A LEVEL FAVORABLE TO THE BACTERIAL DIGESTION PROCESS.
Claim 2
Dependent Claim
89 words
IN ANAEROBIC DISGESTION OF BACTERIALLY DIGESTIBLE ORGANIC MATTER IN A SLUDGE DIGEST, THE METHOD OF CONTROLLING THE PH OF THE SLUDGE UNDERGOING DIGESTION WHICH COMPRISES THE STEPS OF SCRUBING DIGESTER GAS FROM SAID DIGESTER WITH AN ABSORBENT LIQUID ADAPTED TO ABSORB CARBON DIOXIDE AND MIXINGLY CONTACTING SAID SLUDGE UNDERGOING DIGESTION WITH SAID DIGESTER GAS THUS STRIPPED, SAID STRIPPED GAS BEING EFFECTIVE IN ABSORBING DISSOLVED CARBON DIOXIDE FROM THE SLUDGE TO AN EXTEND SUFFICIENT TO BRING THE PH OF THE SLUDGE TO A LEVEL FAVORABLE TO THE BACTERIAL DIGESTION PROCESS.
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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) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |