US2647392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Building block with spaced walls
Assignee: Individual
•
Filing: 1950-03-15
•
Granted: 1953-08-04
•
Expires: 1970-03-15
Abstract
No abstract record available.
Inventors
- 👤 Howe E Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:35
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/02; E04B2/28; E04B2/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US869828A
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US904588A
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US1072760A
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US1436193A
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US1473627A
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US1980982A
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GB470349A
Cited
US2088645A
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US2137759A
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US2280635A
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US2311479A
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US2540349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |