Patent US3440788A successfully refreshed from Google Patents.
US3440788A
Expired / Lapsed
US
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Building blocks with a shell containing a filler and having projections and depressions connected by tubes
Assignee: ARTHUR B MERGET
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Filing: 1965-06-11
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Granted: 1969-04-29
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Expires: 1985-06-11
Abstract
No abstract record available.
Inventors
- 👤 Arthur B Merget
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:49
CPC Classifications
E; E04; E04C; E04C1/00; E04C1/40; E04B; E04B2/00; E04B2/02; E04B2002/0202; E04B2002/0204; E04B2002/0215; E04B2002/0219
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US422901A
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US1250971A
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US1567301A
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US1640065A
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US1950397A
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US1900833A
Cited
GB436287A
Cited
FR878329A
Cited
US2565823A
Cited
GB903072A
Cited
US3180060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-28 | 1972-10-28 | 1973-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-28 | 1976-10-28 | 1977-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-28 | 1980-10-28 | 1981-04-29 | $7700.00 | Window Closed / Lapsed |