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Patent US3407231A successfully refreshed from Google Patents.
US3407231A
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US
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Dimethylacetamide production
Assignee: Shell USA Inc
•
Filing: 1966-05-25
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Granted: 1968-10-22
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Expires: 1986-05-25
Abstract
No abstract record available.
Inventors
- 👤 Nozaki Kenzie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:16
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/94; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12153; Y10T428/12493; Y10T428/12736; Y10T428/1275
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE948056C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-22 | 1972-04-22 | 1972-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-22 | 1976-04-22 | 1976-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-22 | 1980-04-22 | 1980-10-22 | $7700.00 | Window Closed / Lapsed |