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US2631847A
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Assignee: Armstrong World Industries Inc
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Filing: 1949-04-19
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Granted: 1953-03-17
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Expires: 1969-04-19
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Hornberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:39
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/0086; B; B65; B65H; B65H20/00; B65H20/24; B65H23/00; B65H23/04; B65H23/16; B65H2403/00; B65H2403/70; B65H2403/72
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) | 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 |