Patent US2027997A successfully refreshed from Google Patents.
US2027997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet containing copper
Assignee: Individual
•
Filing: 1935-03-06
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Granted: 1936-01-14
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Expires: 1955-03-06
Abstract
No abstract record available.
Inventors
- 👤 Mishima Tokushichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:12
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; B; B01; B01D; B01D35/00; B01D35/06; C22C38/08; C22C38/10; C22C38/12; C22C38/52
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) | 1939-01-13 | 1939-07-15 | 1940-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-01-13 | 1943-07-15 | 1944-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-01-13 | 1947-07-15 | 1948-01-14 | $7700.00 | Window Closed / Lapsed |