US2759668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct reading efficiency indicator
Assignee: Individual
•
Filing: 1953-07-16
•
Granted: 1956-08-21
•
Expires: 1973-07-16
Abstract
No abstract record available.
Inventors
- 👤 Carl A Hielle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:10
CPC Classifications
G; G06; G06G; G06G3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB441643A
Cited
US936591A
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US1056578A
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US1461956A
Cited
US1725617A
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US1678009A
Cited
FR627729A
Cited
DE519924C
Cited
AU1736128A
Cited
US1971238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-21 | 1960-02-20 | 1960-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-21 | 1964-02-20 | 1964-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-21 | 1968-02-20 | 1968-08-21 | $7700.00 | Window Closed / Lapsed |