US2491487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making water-impervious concrete
Assignee: Individual
•
Filing: 1945-07-09
•
Granted: 1949-12-20
•
Expires: 1965-07-09
Abstract
No abstract record available.
Inventors
- 👤 Roy C Faulwetter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:41
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B24/00; C04B24/24; C04B24/26; C04B24/2682; C04B41/0018; Y; Y10; Y10S; Y10S52/00; Y10S52/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1034324A
Cited
GB124669A
Cited
US1331217A
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US1521813A
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US2040320A
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DE682857C
Cited
CH202785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |