US3477949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying waste liquid from water closets and other sanitary installations
Assignee: Liljendahl S A J
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Filing: 1967-10-09
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Granted: 1969-11-11
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Expires: 1987-10-09
Abstract
No abstract record available.
Inventors
- 👤 Sven Algot Joel Liljendahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:37
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236; C02F2103/00; C02F2103/002; C02F2103/005; Y; Y10; Y10S; Y10S210/00; Y10S210/918; Y10S210/92; Y10S4/00; Y10S4/09
Claims Analysis
Total Claims: 0
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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) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |