US2898191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing zinc oxide
Assignee: Merck and Co Inc
•
Filing: 1953-01-02
•
Granted: 1959-08-04
•
Expires: 1973-01-02
Abstract
No abstract record available.
Inventors
- 👤 John B Conn
- 👤 Humphrey William Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:12
CPC Classifications
C; C01; C01G; C01G9/00; C01G9/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US654804A
Cited
US1204843A
Cited
US1579302A
Cited
US1854664A
Cited
US1956585A
Cited
US2348883A
Cited
US2372367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |