US1107135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone-exchange system and apparatus.
Assignee: FREDERICK C STEVENS
•
Filing: 1905-07-11
•
Granted: 1914-08-11
•
Expires: 1925-07-11
Abstract
No abstract record available.
Inventors
- 👤 Edward E Clement
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
H; H04; H04Q; H04Q3/00
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) | 1917-08-10 | 1918-02-09 | 1918-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1921-08-10 | 1922-02-09 | 1922-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1925-08-10 | 1926-02-09 | 1926-08-11 | $7700.00 | Window Closed / Lapsed |