Patent US3472764A successfully refreshed from Google Patents.
US3472764A
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US
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Sewage treatment method and plant
Assignee: Neptune Microfloc Inc
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Filing: 1968-02-05
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Granted: 1969-10-14
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Expires: 1988-02-05
Abstract
No abstract record available.
Inventors
- 👤 Gordon L Culp
- 👤 Sigurd P Hansen
- 👤 John R Stukenberg
- 👤 Robert D Schilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:41
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1236; C02F3/1242; B; B01; B01D; B01D21/00; B01D21/0006; B01D21/0012; B01D21/0018; B01D21/0039; B01D21/0051; B01D21/10; B01D21/24; B01D21/245; B01D21/2466; B01D21/30; B01D21/307; B01D21/32; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3206032A
Cited
US3327855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |