Patent US2744966A successfully refreshed from Google Patents.
US2744966A
Expired / Lapsed
US
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Intercommunication system
Assignee: Executone Inc
•
Filing: 1950-10-05
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Granted: 1956-05-08
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Expires: 1970-10-05
Abstract
No abstract record available.
Inventors
- 👤 Allan C Bernstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:24
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1181665A
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US2269142A
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US2269143A
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US2347079A
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US2385515A
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US2512834A
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US2529912A
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US2554912A
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US2491954A
Cited
US2536820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |