US3715304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling the temperature in a sewage treatment system,and apparatus therefor
Assignee: Individual
•
Filing: 1971-01-11
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Granted: 1973-02-06
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Expires: 1991-01-11
Abstract
Abstract METHOD AND APPARATUS FOR CONTROLLING THE TEMPERATURE IN A BIOLOGICAL BREAKDOWN SYSTEM, SUCH AS SEWAGE TREATMENT, WHEREIN HOT GAS AND/OR STEAM IS ADDED TO THE SYSTEM TO MAINTAIN THE PROPER TEMPERATURE.
Inventors
- 👤 H Hefermehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:53
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1205; C02F3/1215; C02F3/006; C02F3/34; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/916
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |