Patent US2422991A successfully refreshed from Google Patents.
US2422991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of hydropolymers
Assignee: Anglo Iranian Oil Co Ltd
•
Filing: 1942-01-07
•
Granted: 1947-06-24
•
Expires: 1962-01-07
Abstract
No abstract record available.
Inventors
- 👤 Strang Leslie Christopher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:58
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/02; C07C5/03; C07C9/00; C07C2527/00; C07C2527/02; C07C2527/04; C07C2527/043; C07C2527/047
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2172542A
Cited
US2128126A
Cited
US2181640A
Cited
US2135823A
Cited
US2270302A
Cited
US2271942A
Cited
GB501325A
Cited
US2255275A
Cited
US2181942A
Cited
US2262804A
Cited
US2245143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-23 | 1950-12-23 | 1951-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-23 | 1954-12-23 | 1955-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-23 | 1958-12-23 | 1959-06-24 | $7700.00 | Window Closed / Lapsed |