US2981528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying system
Assignee: Armstrong World Industries Inc
•
Filing: 1956-08-14
•
Granted: 1961-04-25
•
Expires: 1976-08-14
Abstract
No abstract record available.
Inventors
- 👤 Charles R Culp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:40
CPC Classifications
F; F26; F26B; F26B13/00; F26B13/10; F26B13/22; F26B13/101
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1964822A
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US2359199A
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US2473629A
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US2471802A
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US2784685A
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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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |