US2989154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Building construction
Assignee: National Steel Corp
•
Filing: 1955-03-17
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Granted: 1961-06-20
•
Expires: 1975-03-17
Abstract
No abstract record available.
Inventors
- 👤 Jr Roy L Colby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:08
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/18; E04B1/24; E04B7/00; E04B7/02; E04B7/022; E04B1/2403; E04B2001/2415; E04B2001/2481; E04B2001/2487; E04B2001/2496
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR20854E
Cited
US1992054A
Cited
US2102277A
Cited
US2185916A
Cited
US2255151A
Cited
US2263214A
Cited
US2246245A
Cited
US2375409A
Cited
US2574074A
Cited
US2549816A
Cited
US2610708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |