US2417995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acetylation of lignocellulosic board materials
Assignee: National Aeronautics and Space Administration
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Filing: 1944-11-14
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Granted: 1947-03-25
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Expires: 1964-11-14
Abstract
No abstract record available.
Inventors
- 👤 Alfred J Stamm
- 👤 Tarkow Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:31
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/14; B; B27; B27K; B27K3/00; B27K3/02; B27K3/0271; B27K3/34; B27K3/346; B27K3/36; C; C08; C08B; C08B3/00; C08B3/06; D21J; D21J1/00; D21J1/08; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31536; Y10T428/31971; Y10T428/31989
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-24 | 1950-09-23 | 1951-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-24 | 1954-09-23 | 1955-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-24 | 1958-09-23 | 1959-03-25 | $7700.00 | Window Closed / Lapsed |