US2521564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible pointer and scale indicator
Assignee: Allen B du Mont Laboratories Inc
•
Filing: 1946-10-24
•
Granted: 1950-09-05
•
Expires: 1966-10-24
Abstract
No abstract record available.
Inventors
- 👤 Bernard Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:46
CPC Classifications
G; G01; G01D; G01D13/00; G01D13/22; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18152
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1695919A
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US1654943A
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US1827959A
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US2185482A
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FR760500A
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US2081752A
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GB496837A
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US2217609A
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US2295387A
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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) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |