US2923538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary kiln construction
Assignee: Monolith Portland Cement Co
•
Filing: 1955-09-19
•
Granted: 1960-02-02
•
Expires: 1975-09-19
Abstract
No abstract record available.
Inventors
- 👤 Paul L Schoonover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:48
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/20; F27B7/32; F27B7/3205; F27B2007/3247; F27B2007/3252
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190505765A
Cited
US1210510A
Cited
US1834963A
Cited
US2218476A
Cited
US2315022A
Cited
GB644247A
Cited
US2687290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |