Patent US5278764A successfully refreshed from Google Patents.
Patent US1549320A successfully refreshed from Google Patents.
US1549320A
Expired / Lapsed
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Heat-insulating structural material
Assignee: AMERICAN BALSA WOOD Corp
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Filing: 1921-08-08
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Granted: 1925-08-11
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Expires: 1941-08-08
Abstract
No abstract record available.
Inventors
- 👤 Andreas P Lundin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:06
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/26; E04C2/284; E04C2/292; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31717; Y10T428/31815; Y10T428/31819; Y10T442/00; Y10T442/30; Y10T442/3382; Y10T442/3415
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1928-08-10 | 1929-02-09 | 1929-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-08-10 | 1933-02-09 | 1933-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-08-10 | 1937-02-09 | 1937-08-11 | $7700.00 | Window Closed / Lapsed |