US2750647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow concrete core form
Assignee: Individual
•
Filing: 1952-03-03
•
Granted: 1956-06-19
•
Expires: 1972-03-03
Abstract
No abstract record available.
Inventors
- 👤 Krieg Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:08
CPC Classifications
E; E04; E04G; E04G11/00; E04G11/06; E04G11/08; E04G11/18; E04B; E04B2/00; E04B2/84; E04B2/86; E04B2002/8682
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1193542A
Cited
US1984007A
Cited
US2192183A
Cited
US2344749A
Cited
US2442962A
Cited
US2460848A
Cited
US2645929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-19 | 1959-12-19 | 1960-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-19 | 1963-12-19 | 1964-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-19 | 1967-12-19 | 1968-06-19 | $7700.00 | Window Closed / Lapsed |