US3342727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and system for sewage treatment
Assignee: Individual
•
Filing: 1965-12-06
•
Granted: 1967-09-19
•
Expires: 1985-12-06
Abstract
No abstract record available.
Inventors
- 👤 Victor A Bringle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:35
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/006; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
IN AN ACTIVATED SLUDGE PROCESS FOR TREATING SEWAGE WHEREIN AIR IS INTRODUCED TO SAID SEWAGE AT A RATE SUFFICIENT TO MAINTAIN THE DISSOLVED OXYGEN CONTENT THEREIN BETWEEN PREDETERMINED MINIMUM AND MAXIMUM LIMITS TO EFFECT AEROBIC DECOMPOSITION THEREOF, THE IMPROVEMENT COMPRISING THE STEPS OF: CONTINUALLY MEASURING THE DISSOLVED OXYGEN CONTENT OF SAID SEWAGE, FEEDING AIR TO SAID SEWAGE AT A PREDETERMINED RATE AS LONG AS SAID DISSOLVED OXYGEN CONTENT REMAINS WITHIN SAID PREDETERMINED LIMITS, WHEN SAID DISSOLVED OXYGEN CONTENT EXCEEDS SAID MAXIMUM LIMIT DECREASING THE RATE OF AIR INTRODUCTION STEPWISE BY PREDETERMINED AMOUNTS AT PREDETERMINED INTERVALS UNTIL SAID DISSOLVED OXYGEN CONTENT DECREASES TO BELOW SAID MAXIMUM LIMIT, WHEN SAID DISSOLVED OXYGEN CONTENT FALLS BELOW SAID MINIMUM LIMIT INCREASING THE RATE OF AIR INTRODUCTION STEPWISE BY PREDETERMIED AMOUNTS AT PREDETERMINED INTERVALS UNTIL SAID DISSOLVED OXYGEN CONTENT INCREASES TO ABOVE SAID MINIMUM LIMIT.
Claim 2
Dependent Claim
140 words
IN AN ACTIVATED SLUDGE PROCESS FOR TREATING SEWAGE WHEREIN AIR IS INTRODUCED TO SAID SEWAGE AT A RATE SUFFICIENT TO MAINTAIN THE DISSOLVED OXYGEN CONTENT THEREIN BETWEEN PREDETERMINED MINIMUM AND MAXIMUM LIMITS TO EFFECT AEROBIC DECOMPOSITION THEREOF, THE IMPROVEMENT COMPRISING THE STEPS OF: CONTINUALLY MEASURING THE DISSOLVED OXYGEN CONTENT OF SAID SEWAGE, FEEDING AIR TO SAID SEWAGE AT A PREDETERMINED RATE AS LONG AS SAID DISSOLVED OXYGEN CONTENT REMAINS WITHIN SAID PREDETERMINED LIMITS, WHEN SAID DISSOLVED OXYGEN CONTENT EXCEEDS SAID MAXIMUM LIMIT DECREASING THE RATE OF AIR INTRODUCTION STEPWISE BY PREDETERMINED AMOUNTS AT PREDETERMINED INTERVALS UNTIL SAID DISSOLVED OXYGEN CONTENT DECREASES TO BELOW SAID MAXIMUM LIMIT, WHEN SAID DISSOLVED OXYGEN CONTENT FALLS BELOW SAID MINIMUM LIMIT INCREASING THE RATE OF AIR INTRODUCTION STEPWISE BY PREDETERMIED AMOUNTS AT PREDETERMINED INTERVALS UNTIL SAID DISSOLVED OXYGEN CONTENT INCREASES TO ABOVE SAID MINIMUM LIMIT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |