US2598679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of abrading
Assignee: Armstrong World Industries Inc
•
Filing: 1948-06-30
•
Granted: 1952-06-03
•
Expires: 1968-06-30
Abstract
No abstract record available.
Inventors
- 👤 Edward L Dryer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:31
CPC Classifications
B; B24; B24B; B24B1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US523046A
Cited
US1733092A
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US1772042A
Cited
US967798A
Cited
US1413060A
Cited
US1910748A
Cited
US2033335A
Cited
DE701220C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-03 | 1955-12-03 | 1956-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-03 | 1959-12-03 | 1960-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-03 | 1963-12-03 | 1964-06-03 | $7700.00 | Window Closed / Lapsed |