US2818945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stair construction
Assignee: Individual
•
Filing: 1954-05-14
•
Granted: 1958-01-07
•
Expires: 1974-05-14
Abstract
No abstract record available.
Inventors
- 👤 Frederick L Holzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:29
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/022; E04F11/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US696503A
Cited
US1866584A
Cited
US1701659A
Cited
US1865059A
Cited
GB424200A
Cited
US2186866A
Cited
US2287561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |