US3291972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital error correcting systems
Assignee: AT&T Inc
•
Filing: 1965-11-01
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Granted: 1966-12-13
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Expires: 1985-11-01
Abstract
No abstract record available.
Inventors
- 👤 Harry A Helm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:18
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0057; H03; H03M; H03M13/00; H03M13/03; H03M13/05; H03M13/13; H03M13/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
IN A DATE PROCESSING SYSTEM, MEANS FOR PERFORMING ITERATIVE ARITHMETIC OPERATIONS OF THE FORM
Claim 2
Dependent Claim
14 words
IN A DATE PROCESSING SYSTEM, MEANS FOR PERFORMING ITERATIVE ARITHMETIC OPERATIONS OF THE FORM
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) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |