US799346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calling device for automatic telephone-exchanges.
Assignee: M E RICHARDSON
•
Filing: 1900-08-27
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Granted: 1905-09-12
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Expires: 1920-08-27
Abstract
No abstract record available.
Inventors
- 👤 Frank A Lundquist
- 👤 John K Norstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:21
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/30; H04M1/31
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) | 1908-09-11 | 1909-03-13 | 1909-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1912-09-11 | 1913-03-13 | 1913-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1916-09-11 | 1917-03-13 | 1917-09-12 | $7700.00 | Window Closed / Lapsed |