US2067019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phthalic anhydride recovery
Assignee: National Aniline and Chemical Co Inc
•
Filing: 1933-12-29
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Granted: 1937-01-05
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Expires: 1953-12-29
Abstract
No abstract record available.
Inventors
- 👤 Riegler Riewen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:20
CPC Classifications
F; F02; F02M; F02M33/00; F02M33/02; F02M33/08; C; C07; C07C; C07C51/00; C07C51/54; C07C51/573; F02M17/00; F02M17/16; F02M29/00; F02M29/02
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) | 1940-01-05 | 1940-07-06 | 1941-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-01-05 | 1944-07-06 | 1945-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-01-05 | 1948-07-06 | 1949-01-05 | $7700.00 | Window Closed / Lapsed |