Patent US2438239A successfully refreshed from Google Patents.
US2438239A
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US
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Ball grinding machine
Assignee: Thompson Grinder Co
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Filing: 1946-07-23
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Granted: 1948-03-23
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Expires: 1966-07-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry A Toulmin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:44
CPC Classifications
B; B24; B24B; B24B11/00; B24B11/02; B24B11/04; B24B11/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US611968A
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US1683974A
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US1579934A
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US1970777A
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US1872405A
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US1846661A
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US2062803A
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US2132280A
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US2087874A
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US2377982A
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US2413880A
Cited
US2377921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-23 | 1951-09-22 | 1952-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-23 | 1955-09-22 | 1956-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-23 | 1959-09-22 | 1960-03-23 | $7700.00 | Window Closed / Lapsed |