Patent US2597818A successfully refreshed from Google Patents.
US2597818A
Expired / Lapsed
US
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Communication system
Assignee: SPX Technologies Inc
•
Filing: 1946-05-09
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Granted: 1952-05-20
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Expires: 1966-05-09
Abstract
No abstract record available.
Inventors
- 👤 Neil D Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:45
CPC Classifications
H; H04; H04W; H04W84/00; H04W84/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1740621A
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US1891299A
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US2061699A
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US2064958A
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US2248746A
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US2265056A
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US2393291A
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US2407846A
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US2469555A
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US2490061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |