US3276994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treatment
Assignee: Individual
•
Filing: 1966-03-09
•
Granted: 1966-10-04
•
Expires: 1986-03-09
Abstract
No abstract record available.
Inventors
- 👤 Charles W Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:05
CPC Classifications
C; C02; C02F; C02F9/00; C02F1/00; C02F1/72; C02F1/78; Y; Y10; Y10S; Y10S261/00; Y10S261/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
THE PROCESS OF TREATING RAW SEWAGE TO REDUCE IT TO WET SOLIDS AND A SUBSTANTIALLY BACTERIA FREE LIQUID COMPRISING, THE STEPS OF PERMITTING THE RAW SEWAGE TO SETTLE FOR A PRESET TIME TO ALLOW METAL AND OTHER HEAVY MATERIAL TO SETTLE TO THE BOTTOM OF SETTLING TANK FOR SUBSEQUENT REMOVAL, THEN PASSING THE SEQAGE THROUGH A STRAINER DEVICE TO REMOVE LARGE LIGHT-WEIGHT OBJECTS, THEN PSSING THE SEWAGE THROUGH A ROTARY CUTTER TO REDUCE THE SIZE OF SOLIDS IN SAID SEWAGE TO ABOUT ONE-HALF INCH OR LESS, THEN CONDUCING THE SEWAGE TO A HIGH SPEED CONTRIFUGE TO SEPARATE THE SEWAGE INTO A LIQUID AND A SEMI-SOLID, THEN SUBJECTING SAID LIQUID TO TREATMENT BY OZONE GAS TO ELEMINATE SUBSTANTIALLY THE BACTERIA THEREIN AND TO PURUGY SAID LIQUID, ALLOWING SAID SEMI-SOLID TO SETTLE IN A SECOND SETTLING TANK TOO FURTHER SEPARATE LIQUID FROM SAID SEMI-SOLID, SUBJECTING THE SOLID FROM SAID SECOND SETTLING TANK TO A SECOND CENTRI-
Claim 2
Dependent Claim
154 words
THE PROCESS OF TREATING RAW SEWAGE TO REDUCE IT TO WET SOLIDS AND A SUBSTANTIALLY BACTERIA FREE LIQUID COMPRISING, THE STEPS OF PERMITTING THE RAW SEWAGE TO SETTLE FOR A PRESET TIME TO ALLOW METAL AND OTHER HEAVY MATERIAL TO SETTLE TO THE BOTTOM OF SETTLING TANK FOR SUBSEQUENT REMOVAL, THEN PASSING THE SEQAGE THROUGH A STRAINER DEVICE TO REMOVE LARGE LIGHT-WEIGHT OBJECTS, THEN PSSING THE SEWAGE THROUGH A ROTARY CUTTER TO REDUCE THE SIZE OF SOLIDS IN SAID SEWAGE TO ABOUT ONE-HALF INCH OR LESS, THEN CONDUCING THE SEWAGE TO A HIGH SPEED CONTRIFUGE TO SEPARATE THE SEWAGE INTO A LIQUID AND A SEMI-SOLID, THEN SUBJECTING SAID LIQUID TO TREATMENT BY OZONE GAS TO ELEMINATE SUBSTANTIALLY THE BACTERIA THEREIN AND TO PURUGY SAID LIQUID, ALLOWING SAID SEMI-SOLID TO SETTLE IN A SECOND SETTLING TANK TOO FURTHER SEPARATE LIQUID FROM SAID SEMI-SOLID, SUBJECTING THE SOLID FROM SAID SECOND SETTLING TANK TO A SECOND CENTRI-
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |