Patent US2841647A successfully refreshed from Google Patents.
US2841647A
Expired / Lapsed
US
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Privacy insuring means for intercommunication systems
Assignee: General Dynamics Corp
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Filing: 1953-12-07
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Granted: 1958-07-01
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Expires: 1973-12-07
Abstract
No abstract record available.
Inventors
- 👤 Angus W Blow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:58
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2360932A
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US2360940A
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US2361160A
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US2522402A
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US2582498A
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US2632812A
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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) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |