US2664561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse-code selective communication system
Assignee: Hazeltine Research Inc
•
Filing: 1950-06-13
•
Granted: 1953-12-29
•
Expires: 1970-06-13
Abstract
No abstract record available.
Inventors
- 👤 Mcilwain Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:58
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/02; B61L3/08; B61L3/12; B61L3/125; B61L23/00; B61L23/08; B61L23/12; G; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/78; G01S13/88; G01S13/93; G01S13/933; H; H04; H04J; H04J3/00
Claims Analysis
Total Claims: 0
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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) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |