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US1445989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration of minerals
Assignee: New Jersey Zinc Co
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Filing: 1919-03-19
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Granted: 1923-02-20
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Expires: 1939-03-19
Abstract
No abstract record available.
Inventors
- 👤 Walter O Borcherdt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:23
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/06
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) | 1926-02-19 | 1926-08-21 | 1927-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-02-19 | 1930-08-21 | 1931-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-02-19 | 1934-08-21 | 1935-02-20 | $7700.00 | Window Closed / Lapsed |