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US1367523A
Expired / Lapsed
US
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Mechanical compound grinding-head for grinding two cylindrical machine parts at the same time
Assignee: FREDERICK M EHEHALT
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Filing: 1920-04-01
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Granted: 1921-02-01
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Expires: 1940-04-01
Abstract
No abstract record available.
Inventors
- 👤 Theis F Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:30
CPC Classifications
B; B24; B24B; B24B41/00; B24B41/06; B24B41/061; B24B41/062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1924-02-01 | 1924-08-02 | 1925-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-02-01 | 1928-08-02 | 1929-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-02-01 | 1932-08-02 | 1933-02-01 | $7700.00 | Window Closed / Lapsed |