US2247266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capillary-active salt of pyridine bases
Assignee: Shell Development Co
•
Filing: 1939-01-14
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Granted: 1941-06-24
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Expires: 1959-01-14
Abstract
No abstract record available.
Inventors
- 👤 Wibaut Johan Pieter
- 👤 Overhoff Johan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:15
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/35; D06M13/355; C; C11; C11D; C11D1/00; C11D1/38; C11D1/62; D06M13/46; D06M13/47; D06M13/477; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/05
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) | 1944-06-23 | 1944-12-23 | 1945-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-06-23 | 1948-12-23 | 1949-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-06-23 | 1952-12-23 | 1953-06-24 | $7700.00 | Window Closed / Lapsed |