Patent US2046153A successfully refreshed from Google Patents.
Patent US2491530A successfully refreshed from Google Patents.
US2491530A
Expired / Lapsed
US
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Hard surface wall and floor covering
Assignee: Armstrong World Industries Inc
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Filing: 1944-11-30
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Granted: 1949-12-20
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Expires: 1964-11-30
Abstract
No abstract record available.
Inventors
- 👤 Stubblebine Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:37
CPC Classifications
D; D06; D06N; D06N7/00; D06N7/0005; D06N7/0039; D06N7/0047; D06N7/0049; Y; Y10; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23914; Y10T428/23943; Y10T428/23979
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) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |