Patent US2437147A successfully refreshed from Google Patents.
US2437147A
Expired / Lapsed
US
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Colloidal mills of the multiple grinding unit type
Assignee: Fuel Res Corp
•
Filing: 1944-05-12
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Granted: 1948-03-02
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Expires: 1964-05-12
Abstract
No abstract record available.
Inventors
- 👤 Ellsworth B A Zwoyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:37
CPC Classifications
B; B02; B02C; B02C7/00; B02C7/11; B02C7/14
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-02 | 1951-09-01 | 1952-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-02 | 1955-09-01 | 1956-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-02 | 1959-09-01 | 1960-03-02 | $7700.00 | Window Closed / Lapsed |