US2684589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlocking hollow building block
Assignee: Formbloc Inc
•
Filing: 1948-02-07
•
Granted: 1954-07-27
•
Expires: 1968-02-07
Abstract
No abstract record available.
Inventors
- 👤 Perreton Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:19
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/02; E04B2/42; E04B2002/0295
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US378838A
Cited
US575209A
Cited
GB190010180A
Cited
US836017A
Cited
US1153900A
Cited
CH63287A
Cited
GB176031A
Cited
US1410588A
Cited
US1652743A
Cited
FR704622A
Cited
US1970414A
Cited
DE677922C
Cited
US2106177A
Cited
US2247614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |