Patent US2428889A successfully refreshed from Google Patents.
US2428889A
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US
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Assignee: Individual
•
Filing: 1945-08-20
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Granted: 1947-10-14
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Expires: 1965-08-20
Abstract
No abstract record available.
Inventors
- 👤 Nutter Irvin Earl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:49
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/16; B01D3/18; B01D3/20; B01D3/205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1273401A
Cited
US1453735A
Cited
AT92960B
Cited
US1735633A
Cited
FR619029A
Cited
US1708685A
Cited
US1812750A
Cited
US2241370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-13 | 1951-04-14 | 1951-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-13 | 1955-04-14 | 1955-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-13 | 1959-04-14 | 1959-10-14 | $7700.00 | Window Closed / Lapsed |