Patent DE1007644B successfully refreshed from Google Patents.
US1781702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of manufacturing high-grade zinc oxide
Assignee: Individual
•
Filing: 1921-07-09
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Granted: 1930-11-18
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Expires: 1941-07-09
Abstract
No abstract record available.
Inventors
- 👤 Frederic E Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:45
CPC Classifications
C; C01; C01G; C01G9/00; C01G9/02
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) | 1933-11-17 | 1934-05-19 | 1934-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-11-17 | 1938-05-19 | 1938-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-11-17 | 1942-05-19 | 1942-11-18 | $7700.00 | Window Closed / Lapsed |