Patent US1744869A successfully refreshed from Google Patents.
US1744869A
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US
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Waterproof concrete and process of making same
Assignee: SILICA PRODUCTS CO
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Filing: 1925-04-20
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Granted: 1930-01-28
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Expires: 1945-04-20
Abstract
No abstract record available.
Inventors
- 👤 Cross Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:01
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B2111/00; C04B2111/20; C04B2111/27; Y; Y10; Y10S; Y10S106/00; Y10S106/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1933-01-27 | 1933-07-29 | 1934-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-01-27 | 1937-07-29 | 1938-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-01-27 | 1941-07-29 | 1942-01-28 | $7700.00 | Window Closed / Lapsed |