Patent US3477581A successfully refreshed from Google Patents.
US3477581A
Expired / Lapsed
US
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Sewage disposal system
Assignee: Individual
•
Filing: 1967-09-21
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Granted: 1969-11-11
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Expires: 1987-09-21
Abstract
No abstract record available.
Inventors
- 👤 Donald M Stearns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:30
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1278; C02F3/1284; C02F3/006; C02F3/1236; C02F3/1252; C02F3/20; C02F3/205; C02F3/26; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1124853A
Cited
US1855982A
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US2089162A
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US2189779A
Cited
GB694918A
Cited
US3092678A
Cited
US3054602A
Cited
US3260368A
Cited
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 |