Patent US2439440A successfully refreshed from Google Patents.
US2439440A
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Method of making disinfectant hydraulic cement
Assignee: North American Cement Corp
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Filing: 1942-10-07
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Granted: 1948-04-13
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Expires: 1962-10-07
Abstract
No abstract record available.
Inventors
- 👤 Amberg Charles Rhodimer
- 👤 Knapp William John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:34
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US446285A
Cited
GB190408504A
Cited
FR425286A
Cited
US1421914A
Cited
US2138805A
Cited
US2267101A
Cited
GB513366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-13 | 1951-10-13 | 1952-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-13 | 1955-10-13 | 1956-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-13 | 1959-10-13 | 1960-04-13 | $7700.00 | Window Closed / Lapsed |