Patent US2669861A successfully refreshed from Google Patents.
US2669861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wall building unit
Assignee: Individual
•
Filing: 1950-02-10
•
Granted: 1954-02-23
•
Expires: 1970-02-10
Abstract
No abstract record available.
Inventors
- 👤 Elmer S Clutter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:19
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)
US915570A
Cited
US1011753A
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US1142093A
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US1415197A
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US1538549A
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US1519099A
Cited
US1962906A
Cited
FR820650A
Cited
US2194047A
Cited
US2309420A
Cited
US2412253A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |