US2552629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Error-detecting and correcting system
Assignee: AT&T Inc
•
Filing: 1950-01-11
•
Granted: 1951-05-15
•
Expires: 1970-01-11
Abstract
No abstract record available.
Inventors
- 👤 Richard W Hamming
- 👤 Bernard D Holbrook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:52
CPC Classifications
H; H03; H03M; H03M13/00; H03M13/03; H03M13/05; H03M13/13; H03M13/19; H04; H04L; H04L1/00; H04L1/12; H04L1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2520142A
Cited
US2512038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |