Patent US2647348A successfully refreshed from Google Patents.
US2647348A
Expired / Lapsed
US
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Feed mechanism for internal grinding machines
Assignee: Heald Machine Co
•
Filing: 1952-02-20
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Granted: 1953-08-04
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Expires: 1972-02-20
Abstract
No abstract record available.
Inventors
- 👤 Robert S Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:56
CPC Classifications
B; B24; B24B; B24B49/00; B24B49/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1845172A
Cited
FR669887A
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US1879388A
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US2116593A
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US2334581A
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US2367069A
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US2389224A
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US2525364A
Cited
US2544156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |