US2631381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making wallboard
Assignee: Individual
•
Filing: 1947-07-10
•
Granted: 1953-03-17
•
Expires: 1967-07-10
Abstract
No abstract record available.
Inventors
- 👤 Eastman A Burrows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:01
CPC Classifications
B; B28; B28B; B28B19/00; B28B19/0092; B27; B27N; B27N3/00; B27N3/08; B27N3/20; B27N3/203; B28B11/00; B28B11/12; B28B11/24; D; D21; D21J; D21J1/00; Y; Y10; Y10S; Y10S425/00; Y10S425/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR762146A
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GB552680A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |