Patent US2478756A successfully refreshed from Google Patents.
US2478756A
Expired / Lapsed
US
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Corrosion inhibitors
Assignee: Merck and Co Inc
•
Filing: 1946-02-26
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Granted: 1949-08-09
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Expires: 1966-02-26
Abstract
No abstract record available.
Inventors
- 👤 Jr John A Elder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:54
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB257881A
Cited
US2139123A
Cited
US1847711A
Cited
US1988584A
Cited
US2126173A
Cited
US2249800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-08 | 1953-02-07 | 1953-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-08 | 1957-02-07 | 1957-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-08 | 1961-02-07 | 1961-08-09 | $7700.00 | Window Closed / Lapsed |