US3523639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door triggered service indicator for rural type mailbox
Assignee: Individual
•
Filing: 1968-08-02
•
Granted: 1970-08-11
•
Expires: 1988-08-02
Abstract
No abstract record available.
Inventors
- 👤 Walter Wiebe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:45
CPC Classifications
A; A47; A47G; A47G29/00; A47G29/12; A47G29/1209; A47G29/121; A47G2029/12105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US884964A
Cited
US1248171A
Cited
US1685874A
Cited
US2480469A
Cited
US2483992A
Cited
US2812130A
Cited
US3014641A
Cited
US3072322A
Cited
US3095140A
Cited
US3291386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |