US2081405A
Expired / Lapsed
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Assignee: AT&T Inc
•
Filing: 1935-07-27
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Granted: 1937-05-25
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Expires: 1955-07-27
Abstract
No abstract record available.
Inventors
- 👤 Warren P Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:43
CPC Classifications
G; G04; G04F; G04F5/00; G04F5/04; G04F5/06; G04F5/063; C; C07; C07C; C07C209/00; C07C209/44; C07C209/48; H; H03; H03H; H03H9/00; H03H9/0023; H03H9/0095; H03H9/46; H03H9/54; H03H9/56; H03H9/566; H03H9/58; H03H9/60; Y; Y10; Y10S; Y10S84/00; Y10S84/09
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) | 1940-05-24 | 1940-11-23 | 1941-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-05-24 | 1944-11-23 | 1945-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-05-24 | 1948-11-23 | 1949-05-25 | $7700.00 | Window Closed / Lapsed |