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US2933559A
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US
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Assignee: Individual
•
Filing: 1956-06-06
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Granted: 1960-04-19
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Expires: 1976-06-06
Abstract
No abstract record available.
Inventors
- 👤 Charles A Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:24
CPC Classifications
H; H04; H04L; H04L21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2123459A
Cited
US2198248A
Cited
US2365458A
Cited
US2457133A
Cited
USRE23713E
Cited
US2679035A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |