Patent US2888820A successfully refreshed from Google Patents.
US2888820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Building blocks
Assignee: Individual
•
Filing: 1954-03-25
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Granted: 1959-06-02
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Expires: 1974-03-25
Abstract
No abstract record available.
Inventors
- 👤 Charles L Sanford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:36
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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US1314772A
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US1447267A
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US773404A
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US1055074A
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US1566228A
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US1933600A
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US2014315A
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GB498386A
Cited
US2268044A
Cited
US2321449A
Cited
US2630701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |