Patent US2086731A successfully refreshed from Google Patents.
US2086731A
Expired / Lapsed
US
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Recovery of hydrocyanic acid
Assignee: Shell Development Co
•
Filing: 1933-06-28
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Granted: 1937-07-13
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Expires: 1953-06-28
Abstract
No abstract record available.
Inventors
- 👤 Russell W Millar
- 👤 Herbert P A Groll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:38
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/02; C01C3/04; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54; C10; C10K; C10K1/00; C10K1/08; C10K1/16
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) | 1940-07-12 | 1941-01-11 | 1941-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-07-12 | 1945-01-11 | 1945-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-07-12 | 1949-01-11 | 1949-07-13 | $7700.00 | Window Closed / Lapsed |