Patent US2451582A successfully refreshed from Google Patents.
US2451582A
Expired / Lapsed
US
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Apparatus for producing mineral wool
Assignee: American Rock Wool Corp
•
Filing: 1941-09-09
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Granted: 1948-10-19
•
Expires: 1961-09-09
Abstract
No abstract record available.
Inventors
- 👤 Herbert C Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:13
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/06
Claims Analysis
Total Claims: 0
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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) | 1951-10-19 | 1952-04-19 | 1952-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-19 | 1956-04-19 | 1956-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-19 | 1960-04-19 | 1960-10-19 | $7700.00 | Window Closed / Lapsed |