Patent US2970307A successfully refreshed from Google Patents.
US2970307A
Expired / Lapsed
US
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Digitalizers
Assignee: INSTR DEV LAB Inc
•
Filing: 1957-02-08
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Granted: 1961-01-31
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Expires: 1977-02-08
Abstract
No abstract record available.
Inventors
- 👤 George P Bentley
- 👤 George C Mcnabb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:24
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/22; H03M1/24; H03M1/28; H03M1/282
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2502837A
Cited
US2713680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |