US2793006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calender roll
Assignee: Armstrong World Industries Inc
•
Filing: 1953-12-15
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Granted: 1957-05-21
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Expires: 1973-12-15
Abstract
No abstract record available.
Inventors
- 👤 Eaby Leroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:06
CPC Classifications
F; F28; F28F; F28F5/00; F28F5/02; D; D06; D06N; D06N3/00; D06N3/0086; D21; D21F; D21F5/00; D21F5/02; D21G; D21G1/00; D21G1/02; D21G1/0253; D21G1/0286; D21G9/00; D21G9/009; D21J; D21J1/00; F16; F16L; F16L39/00; F16L39/06; Y; Y10; Y10S; Y10S165/00; Y10S165/135; Y10S165/139; Y10S165/14
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) | 1960-05-20 | 1960-11-19 | 1961-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-20 | 1964-11-19 | 1965-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-20 | 1968-11-19 | 1969-05-21 | $7700.00 | Window Closed / Lapsed |