Patent US2809028A successfully refreshed from Google Patents.
US2809028A
Expired / Lapsed
US
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Iron retention and slag regulating pit
Assignee: Individual
•
Filing: 1955-02-28
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Granted: 1957-10-08
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Expires: 1975-02-28
Abstract
No abstract record available.
Inventors
- 👤 Selwyne P Kinney
- 👤 Osborne Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:37
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US515081A
Cited
GB226700A
Cited
US1590730A
Cited
US1820597A
Cited
US2426607A
Cited
US2552648A
Cited
US2659120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |