US2683916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of accelerating the hardening of concrete slabs
Assignee: Individual
•
Filing: 1952-05-23
•
Granted: 1954-07-20
•
Expires: 1972-05-23
Abstract
No abstract record available.
Inventors
- 👤 Joseph C Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:20
CPC Classifications
B; B28; B28B; B28B11/00; B28B11/24; B28B11/242; Y; Y10; Y10S; Y10S264/00; Y10S264/43; Y10S264/46; Y10S425/00; Y10S425/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US508112A
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US661443A
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US1098436A
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US1808762A
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US2152365A
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US2500866A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-19 | 1958-01-18 | 1958-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-19 | 1962-01-18 | 1962-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-19 | 1966-01-18 | 1966-07-20 | $7700.00 | Window Closed / Lapsed |