US2647640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display card
Assignee: GEN CEMENT Manufacturing CO
•
Filing: 1947-01-09
•
Granted: 1953-08-04
•
Expires: 1967-01-09
Abstract
No abstract record available.
Inventors
- 👤 Richard G Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:23
CPC Classifications
G; G09; G09F; G09F5/00; G09F5/04; G09F5/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |