US2977658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cores for manufacture of precast slabs
Assignee: Flexicore Co Inc
•
Filing: 1958-07-21
•
Granted: 1961-04-04
•
Expires: 1978-07-21
Abstract
No abstract record available.
Inventors
- 👤 Warner B Smith
- 👤 Baber Claude
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:15
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/28; B28B7/30; B28B7/306; B28B7/32; B29; B29C; B29C33/00; B29C33/44; B29C33/48; B29C33/50; B29C33/505
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1605782A
Cited
US1570915A
Cited
US2052818A
Cited
GB554269A
Cited
GB554336A
Cited
US2485898A
Cited
US2612673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |