Patent US2870544A successfully refreshed from Google Patents.
US2870544A
Expired / Lapsed
US
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Method of drying fibrous boards
Assignee: Armstrong World Industries Inc
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Filing: 1956-01-24
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Granted: 1959-01-27
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Expires: 1976-01-24
Abstract
No abstract record available.
Inventors
- 👤 George E Gard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:09
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/46; H05B6/62; F; F26; F26B; F26B3/00; F26B3/32; F26B3/34; Y; Y10; Y10S; Y10S56/00; Y10S56/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2231457A
Cited
US2397615A
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US2434573A
Cited
US2397897A
Cited
US2492187A
Cited
GB714274A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-26 | 1962-07-28 | 1963-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-26 | 1966-07-28 | 1967-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-26 | 1970-07-28 | 1971-01-27 | $7700.00 | Window Closed / Lapsed |