US2432981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making calcareous-silicious insulating units
Assignee: —
•
Filing: —
•
Granted: 1947-12-23
•
Expires: 1964-12-23
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:53
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/18; C04B2111/00; C04B2111/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1569755A
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US683337A
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US1045933A
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US965007A
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US1107431A
Cited
US1666936A
Cited
US1812306A
Cited
US1861727A
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US1932971A
Cited
US2243369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-22 | 1951-06-23 | 1951-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-22 | 1955-06-23 | 1955-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-22 | 1959-06-23 | 1959-12-23 | $7700.00 | Window Closed / Lapsed |