US3420504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railings,ladders,trusses and similar type articles
Assignee: PICO SAFE STAIRS Co
•
Filing: 1966-08-18
•
Granted: 1969-01-07
•
Expires: 1986-08-18
Abstract
No abstract record available.
Inventors
- 👤 Earl Mulitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:41
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/18; E04F11/181
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
NL302417A
Cited
US3125192A
Cited
US1123090A
Cited
US1951811A
Cited
US2056842A
Cited
US2427723A
Cited
US2431546A
Cited
US3028192A
Cited
US3170201A
Cited
US3195864A
Cited
US3142550A
Cited
AT236609B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |