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Patent US2434681A successfully refreshed from Google Patents.
US2434681A
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Remotely controlled electrical calculator
Assignee: AT&T Inc
•
Filing: 1943-02-13
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Granted: 1948-01-20
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Expires: 1963-02-13
Abstract
No abstract record available.
Inventors
- 👤 Samuel B Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:41
CPC Classifications
H; H03; H03M; H03M7/00; H03M7/02; H03M7/06; H03M7/08
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-01-19 | 1951-07-21 | 1952-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-01-19 | 1955-07-21 | 1956-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-01-19 | 1959-07-21 | 1960-01-20 | $7700.00 | Window Closed / Lapsed |