US3457550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic handshaking method and apparatus for data transmission systems
Assignee: AT&T Inc
•
Filing: 1967-07-11
•
Granted: 1969-07-22
•
Expires: 1987-07-11
Abstract
No abstract record available.
Inventors
- 👤 Richard B Gibson
- 👤 Douglas A Kerr
- 👤 Thomas E Lindsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:16
CPC Classifications
H; H04; H04L; H04L12/00; H04L5/00; H04L5/14; H04L5/1415
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |