US2768137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for digesting sludge
Assignee: Pacific Flush Tank Co
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Filing: 1953-11-19
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Granted: 1956-10-23
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Expires: 1973-11-19
Abstract
No abstract record available.
Inventors
- 👤 Harry E Schlenz
- 👤 Lawrence E Langdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:27
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/28; Y; Y10; Y10S; Y10S210/00; Y10S210/09; Y10T; Y10T137/00; Y10T137/8593; Y10T137/85978; Y10T137/86115
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
THE METHOD OF DISPERSING THE SCUM LAYER WHICH FORMS ON THE DIGESTING MASS OF MATERIAL IN THE BIOLOGICAL DIGESTION OF ORGANIC WASTES WHICH METHOD COMPRISES INJECTING SLUDGE GAS UNDER PRESSURE INTO THE DIGESTING MASS FOR FIXED PERIODS SUCCESSIVELY AT EACH OF A PLURALITY OF LATERALLY SPCED LOCATIONS UNDER THE SCUM LAYER AND GENERALLY CIRCUMFERENTIALLY ABOUT THE CENTRAL VERTICAL AXIS OF THE MASS.
Claim 2
Independent Claim
62 words
THE METHOD OF DISPERSING THE SCUM LAYER WHICH FORMS ON THE DIGESTING MASS OF MATERIAL IN THE BIOLOGICAL DIGESTION OF ORGANIC WASTES WHICH METHOD COMPRISES INJECTING SLUDGE GAS UNDER PRESSURE INTO THE DIGESTING MASS FOR FIXED PERIODS SUCCESSIVELY AT EACH OF A PLURALITY OF LATERALLY SPCED LOCATIONS UNDER THE SCUM LAYER AND GENERALLY CIRCUMFERENTIALLY ABOUT THE CENTRAL VERTICAL AXIS OF THE MASS.
References Cited (Backward Citations)
US2538412A
Cited
US2640027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |