Patent US1933586A successfully refreshed from Google Patents.
Patent US2518640A successfully refreshed from Google Patents.
US2518640A
Expired / Lapsed
US
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Insulated building block
Assignee: Individual
•
Filing: 1946-01-11
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Granted: 1950-08-15
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Expires: 1966-01-11
Abstract
No abstract record available.
Inventors
- 👤 John B Purinton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:40
CPC Classifications
E; E04; E04C; E04C1/00; E04C1/40; E04B; E04B2/00; E04B2/02; E04B2002/0256; E04B2002/0267
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1078714A
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US1985328A
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US2004739A
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US2176213A
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US2182470A
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US2305684A
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US2320480A
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US2321449A
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US2303837A
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US2457982A
Cited
US2382474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-14 | 1954-02-13 | 1954-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-14 | 1958-02-13 | 1958-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-14 | 1962-02-13 | 1962-08-15 | $7700.00 | Window Closed / Lapsed |