Patent US3400392A successfully refreshed from Google Patents.
US3400392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Code signal transmitter automatically deenergized upon transmitting an endof-messagesignal
Assignee: HAROLD E LEVITT
•
Filing: 1967-08-15
•
Granted: 1968-09-03
•
Expires: 1987-08-15
Abstract
No abstract record available.
Inventors
- 👤 Frederick P Willcox
- 👤 Newland M Smith
- 👤 Harold E Levitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:04
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/16; G07; G07C; G07C9/00; G07C9/30; H; H04; H04L; H04L1/00; H04L1/0078; H04L1/0083
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |