US3414485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for drying methacrylic acid by extraction and azeotropic distillation
Assignee: Escambia Chemical Corp
•
Filing: 1967-05-17
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Granted: 1968-12-03
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Expires: 1987-05-17
Abstract
No abstract record available.
Inventors
- 👤 George B H Speed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:03
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; C07C51/42; C07C51/48; Y; Y10; Y10S; Y10S203/00; Y10S203/03; Y10S203/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1668380A
Cited
US1915002A
Cited
US2266004A
Cited
GB650343A
Cited
US2922815A
Cited
US3337740A
Cited
US3344178A
Cited
GB997325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-03 | 1972-06-03 | 1972-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-03 | 1976-06-03 | 1976-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-03 | 1980-06-03 | 1980-12-03 | $7700.00 | Window Closed / Lapsed |