US2612673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansible molding core
Assignee: VACUUM CONCRETE Inc
•
Filing: 1949-03-09
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Granted: 1952-10-07
•
Expires: 1969-03-09
Abstract
No abstract record available.
Inventors
- 👤 Karl P Billner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:16
CPC Classifications
E; E04; E04G; E04G11/00; E04G11/04; B; B28; B28B; B28B21/00; B28B21/02; B28B21/10; B28B21/18; B28B21/20; B28B21/205; E04G11/045; F; F16; F16L; F16L1/00; F16L1/024; F16L1/028; F16L1/038
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US720718A
Cited
US1149669A
Cited
FR491298A
Cited
US2052818A
Cited
US2312587A
Cited
US2395216A
Cited
US2421584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-07 | 1956-04-07 | 1956-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-07 | 1960-04-07 | 1960-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-07 | 1964-04-07 | 1964-10-07 | $7700.00 | Window Closed / Lapsed |