US3511000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlocking hollow building blocks
Assignee: Individual
•
Filing: 1968-08-08
•
Granted: 1970-05-12
•
Expires: 1988-08-08
Abstract
No abstract record available.
Inventors
- 👤 Henry P C Keuls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:21
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/74; E04B2/76; E04B2/78; E04B2/7854; E04B2/7863; E04B2/82; E04C; E04C2/00; E04C2/30; E04C2/38; E04C2/384
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US683442A
Cited
US1250971A
Cited
US2005301A
Cited
US2881876A
Cited
GB795078A
Cited
US3189140A
Cited
US3192738A
Cited
US3180059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-11 | 1973-11-10 | 1974-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-11 | 1977-11-10 | 1978-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-11 | 1981-11-10 | 1982-05-12 | $7700.00 | Window Closed / Lapsed |