US2081787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic process and apparatus for the production of chromic acid and caustic alkali
Assignee: CHROMIUM PRODUCTS Corp
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Filing: 1936-06-15
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Granted: 1937-05-25
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Expires: 1956-06-15
Abstract
No abstract record available.
Inventors
- 👤 John W Boss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:17
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/22; C01; C01G; C01G37/00; C01G37/02; C01G37/033; C25B1/14; C25B1/16
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) | 1940-05-24 | 1940-11-23 | 1941-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-05-24 | 1944-11-23 | 1945-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-05-24 | 1948-11-23 | 1949-05-25 | $7700.00 | Window Closed / Lapsed |