US1715415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Volume-control system
Assignee: AT&T Inc
•
Filing: 1925-12-19
•
Granted: 1929-06-04
•
Expires: 1945-12-19
Abstract
No abstract record available.
Inventors
- 👤 Oscar B Hanson
- 👤 Crisson George
- 👤 Frederick W Mckown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:03
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/62; H04B1/64
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) | 1932-06-03 | 1932-12-03 | 1933-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-06-03 | 1936-12-03 | 1937-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-06-03 | 1940-12-03 | 1941-06-04 | $7700.00 | Window Closed / Lapsed |