Patent US2838131A successfully refreshed from Google Patents.
US2838131A
Expired / Lapsed
US
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Separator
Assignee: Osborn Manufacturing Corp
•
Filing: 1954-09-03
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Granted: 1958-06-10
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Expires: 1974-09-03
Abstract
No abstract record available.
Inventors
- 👤 Ruben O Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:39
CPC Classifications
B; B01; B01D; B01D45/00; B01D45/04; B01D45/08; B01D46/00; B01D46/0027; B01D46/003; B01D46/28; B01D35/00; B01D35/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1531096A
Cited
US1888813A
Cited
DE606674C
Cited
GB538282A
Cited
US2468354A
Cited
US2642954A
Cited
US2660261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |