Patent US2874850A successfully refreshed from Google Patents.
US2874850A
Expired / Lapsed
US
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Apparatus for separating oil and water
Assignee: Individual
•
Filing: 1955-06-16
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Granted: 1959-02-24
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Expires: 1975-06-16
Abstract
No abstract record available.
Inventors
- 👤 Douglas G Unthank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:41
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/26; F22B37/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE41183C
Cited
GB191109447A
Cited
US1262076A
Cited
AU2819230A
Cited
US2175563A
Cited
GB553379A
Cited
US2624463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |