US2949703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prefabricated step unit
Assignee: Individual
•
Filing: 1957-11-12
•
Granted: 1960-08-23
•
Expires: 1977-11-12
Abstract
No abstract record available.
Inventors
- 👤 Edmund R Katzmarek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:22
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US559081A
Cited
US919789A
Cited
US947743A
Cited
US1012735A
Cited
GB183735A
Cited
US1565580A
Cited
US2239428A
Cited
US2695689A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |