US2421603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mailbox signaling device
Assignee: Individual
•
Filing: 1945-01-06
•
Granted: 1947-06-03
•
Expires: 1965-01-06
Abstract
No abstract record available.
Inventors
- 👤 Doppelhammer John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:21
CPC Classifications
A; A47; A47G; A47G29/00; A47G29/12; A47G29/1209; A47G29/121; G; G08; G08B; G08B5/00; A47G2029/12105
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US825503A
Cited
US1535677A
Cited
US1627617A
Cited
US1949578A
Cited
US2098242A
Cited
US2078160A
Cited
US2352975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |