US1356403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone system
Assignee: Philips North America LLC
•
Filing: 1918-05-07
•
Granted: 1920-10-19
•
Expires: 1938-05-07
Abstract
No abstract record available.
Inventors
- 👤 Edwin S Pridham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:11
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/001
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) | 1923-10-19 | 1924-04-19 | 1924-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-10-19 | 1928-04-19 | 1928-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-10-19 | 1932-04-19 | 1932-10-19 | $7700.00 | Window Closed / Lapsed |