US2745920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Empty indicator for raw coal pipes and the like
Assignee: Individual
•
Filing: 1951-06-18
•
Granted: 1956-05-15
•
Expires: 1971-06-18
Abstract
No abstract record available.
Inventors
- 👤 Lester M Keephart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:50
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/14; G01F23/18; G01F23/185; F; F23; F23K; F23K3/00; F23K2203/00; F23K2203/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US848519A
Cited
DE414117C
Cited
US1885051A
Cited
US1847844A
Cited
US1892790A
Cited
US2043530A
Cited
GB540295A
Cited
US2349519A
Cited
US2611044A
Cited
US2615102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |