US2754503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital reading apparatus
Assignee: Arthur D Little Inc
•
Filing: 1951-12-21
•
Granted: 1956-07-10
•
Expires: 1971-12-21
Abstract
No abstract record available.
Inventors
- 👤 Forbes G Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:18
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/06; H03M1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB647811A
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US2630481A
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US2518022A
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US2623115A
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US2583711A
Cited
US2600744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-10 | 1960-01-09 | 1960-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-10 | 1964-01-09 | 1964-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-10 | 1968-01-09 | 1968-07-10 | $7700.00 | Window Closed / Lapsed |