US3447633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic safety ladder
Assignee: SAMUEL J MONTALTO
•
Filing: 1967-10-19
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Granted: 1969-06-03
•
Expires: 1987-10-19
Abstract
No abstract record available.
Inventors
- 👤 Samuel J Montalto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:14
CPC Classifications
E; E04; E04H; E04H4/00; E04H4/14; E04H4/144; E06; E06C; E06C7/00; E06C7/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US909825A
Cited
US1021094A
Cited
US2643808A
Cited
US3093209A
Cited
US3288248A
Cited
US3390740A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |