Patent US2539904A successfully refreshed from Google Patents.
US2539904A
Expired / Lapsed
US
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Cement wool building material
Assignee: Individual
•
Filing: 1947-11-15
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Granted: 1951-01-30
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Expires: 1967-11-15
Abstract
No abstract record available.
Inventors
- 👤 Hansen Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:10
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/24397; Y10T428/29; Y10T428/31504; Y10T428/31971; Y10T428/31989
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1040321A
Cited
US1407608A
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US1618512A
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US1537406A
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US1702776A
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US2110053A
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US2063309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |