Patent US1378950A successfully refreshed from Google Patents.
US1378950A
Expired / Lapsed
US
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Recording-key
Assignee: AT&T Inc
•
Filing: 1918-12-04
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Granted: 1921-05-24
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Expires: 1938-12-04
Abstract
No abstract record available.
Inventors
- 👤 Augustus D Hargan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:43
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/72; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20207; Y10T74/20238
Claims Analysis
Total Claims: 0
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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) | 1924-05-23 | 1924-11-22 | 1925-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-05-23 | 1928-11-22 | 1929-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-05-23 | 1932-11-22 | 1933-05-24 | $7700.00 | Window Closed / Lapsed |