Patent US2579050A successfully refreshed from Google Patents.
US2579050A
Expired / Lapsed
US
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Enameling of concrete materials
Assignee: Stark Ceramics Inc
•
Filing: 1948-06-07
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Granted: 1951-12-18
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Expires: 1968-06-07
Abstract
No abstract record available.
Inventors
- 👤 William S Ramsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:52
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/52; C04B41/60; C04B41/61; C04B41/70; Y; Y10; Y10S; Y10S264/00; Y10S264/57
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US723279A
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US772247A
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US850670A
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US1045587A
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US1439410A
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DE415163C
Cited
US1521233A
Cited
US2259935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |