Patent US1860724A successfully refreshed from Google Patents.
US1860724A
Expired / Lapsed
US
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Polishing and grinding material and process for making same
Assignee: TRUSTEES OF SECURITY GRIND
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Filing: 1928-03-26
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Granted: 1932-05-31
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Expires: 1948-03-26
Abstract
No abstract record available.
Inventors
- 👤 Franz A Schumacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:12
CPC Classifications
B; B24; B24D; B24D5/00; B24D5/02; B24D5/04; B24D18/00; B24D18/0081
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) | 1935-05-31 | 1935-11-30 | 1936-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-05-31 | 1939-11-30 | 1940-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-05-31 | 1943-11-30 | 1944-05-31 | $7700.00 | Window Closed / Lapsed |