US2481508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closure-feeding device
Assignee: Armstrong World Industries Inc
•
Filing: 1947-06-27
•
Granted: 1949-09-13
•
Expires: 1967-06-27
Abstract
No abstract record available.
Inventors
- 👤 Gschwend Paul
- 👤 John M Sharf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:12
CPC Classifications
B; B67; B67B; B67B3/00; B67B3/22; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53313; Y10T29/53322
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US882728A
Cited
US1907900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-12 | 1953-03-14 | 1953-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-12 | 1957-03-14 | 1957-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-12 | 1961-03-14 | 1961-09-13 | $7700.00 | Window Closed / Lapsed |