US2535303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: AT&T Inc
•
Filing: 1949-10-21
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Granted: 1950-12-26
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Expires: 1969-10-21
Abstract
No abstract record available.
Inventors
- 👤 Willard D Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:59
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H03; H03K; H03K17/00; H03K17/51; H03K17/74; H04J; H04J3/00; H04J3/02; H04J3/04; Y; Y10; Y10S; Y10S84/00; Y10S84/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2258732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |