Patent US1922697A successfully refreshed from Google Patents.
US1922697A
Expired / Lapsed
US
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Prepared calcium chloride and method of making same
Assignee: Dow Chemical Co
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Filing: 1929-11-04
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Granted: 1933-08-15
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Expires: 1949-11-04
Abstract
No abstract record available.
Inventors
- 👤 Sheldon B Heath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:31
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/20; C01F11/24; C01F11/30
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) | 1936-08-14 | 1937-02-13 | 1937-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-08-14 | 1941-02-13 | 1941-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-08-14 | 1945-02-13 | 1945-08-15 | $7700.00 | Window Closed / Lapsed |