US2482308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst preparation
Assignee: EIDP Inc
•
Filing: 1947-02-21
•
Granted: 1949-09-20
•
Expires: 1967-02-21
Abstract
No abstract record available.
Inventors
- 👤 Christian J Wernlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:17
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/34; B01J37/348; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/889; B01J23/8892
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US476639A
Cited
US1352208A
Cited
US1524937A
Cited
US1776787A
Cited
US1975239A
Cited
US1907710A
Cited
US2320773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-19 | 1953-03-21 | 1953-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-19 | 1957-03-21 | 1957-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-19 | 1961-03-21 | 1961-09-20 | $7700.00 | Window Closed / Lapsed |