Patent US2509833A successfully refreshed from Google Patents.
US2509833A
Expired / Lapsed
US
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Magnifying and light concentrating device for telephone dials
Assignee: Individual
•
Filing: 1947-01-16
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Granted: 1950-05-30
•
Expires: 1967-01-16
Abstract
No abstract record available.
Inventors
- 👤 Miller Tobias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:07
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1484742A
Cited
US1466286A
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US1553856A
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US1723297A
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US1823958A
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US1860606A
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US2061097A
Cited
US2147944A
Cited
US2198935A
Cited
US2195672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |