Patent DE106750C successfully refreshed from Google Patents.
US1962887A
Expired / Lapsed
US
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Method of controlling crystal size
Assignee: Wyeth Holdings LLC
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Filing: 1931-02-07
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Granted: 1934-06-12
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Expires: 1951-02-07
Abstract
No abstract record available.
Inventors
- 👤 Kenneth D Ashley
- 👤 Waldemar C Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:10
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/46; C01F11/466
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) | 1937-06-11 | 1937-12-11 | 1938-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-06-11 | 1941-12-11 | 1942-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-06-11 | 1945-12-11 | 1946-06-12 | $7700.00 | Window Closed / Lapsed |