Patent US2609447A successfully refreshed from Google Patents.
Patent US1352940A successfully refreshed from Google Patents.
US1352940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optiphone
Assignee: Individual
•
Filing: 1916-07-31
•
Granted: 1920-09-14
•
Expires: 1936-07-31
Abstract
No abstract record available.
Inventors
- 👤 Fay C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:17
CPC Classifications
G; G09; G09B; G09B21/00; G09B21/001; G09B21/006
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) | 1923-09-14 | 1924-03-15 | 1924-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-09-14 | 1928-03-15 | 1928-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-09-14 | 1932-03-15 | 1932-09-14 | $7700.00 | Window Closed / Lapsed |