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US3381559A
Expired / Lapsed
US
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Inspection device
Assignee: Armstrong World Industries Inc
•
Filing: 1965-03-01
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Granted: 1968-05-07
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Expires: 1985-03-01
Abstract
No abstract record available.
Inventors
- 👤 Harold M Lefever
- 👤 Frederick W Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:49
CPC Classifications
B; B21; B21D; B21D43/00; B21D43/02; B21D43/025; Y; Y10; Y10T; Y10T83/00; Y10T83/081; Y10T83/086
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1447381A
Cited
US1819431A
Cited
US1717426A
Cited
US2083312A
Cited
US2942729A
Cited
US3160045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |