US2420144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scale resistant concrete and cement
Assignee: Dewey and Almy Chemical Co
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Filing: 1942-02-18
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Granted: 1947-05-06
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Expires: 1962-02-18
Abstract
No abstract record available.
Inventors
- 👤 Jacob G Mark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:26
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-05 | 1950-11-04 | 1951-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-05 | 1954-11-04 | 1955-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-05 | 1958-11-04 | 1959-05-06 | $7700.00 | Window Closed / Lapsed |