Patent US2198737A successfully refreshed from Google Patents.
US2198737A
Expired / Lapsed
US
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Method of treating waste materials containing organic substances of animal or vegetable origin by mesophile or thermophile anaerobic conversion
Assignee: Individual
•
Filing: 1938-06-25
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Granted: 1940-04-30
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Expires: 1958-06-25
Abstract
No abstract record available.
Inventors
- 👤 Petersen Kai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:55
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/28; C12; C12M; C12M21/00; C12M21/04; C12M23/00; C12M23/36; C12M27/00; C12M27/10; Y; Y02; Y02E; Y02E50/00; Y02E50/30; Y10; Y10S; Y10S435/00; Y10S435/818
Claims Analysis
Total Claims: 0
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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) | 1943-04-30 | 1943-10-30 | 1944-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-04-30 | 1947-10-30 | 1948-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-04-30 | 1951-10-30 | 1952-04-30 | $7700.00 | Window Closed / Lapsed |