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US2481949A
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Method and apparatus for the production of felted rock wool
Assignee: Individual
•
Filing: 1946-12-02
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Granted: 1949-09-13
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Expires: 1966-12-02
Abstract
No abstract record available.
Inventors
- 👤 Charles D Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:58
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/06; Y; Y10; Y10T; Y10T156/00; Y10T156/17; Y10T156/1702; Y10T156/1712; Y10T156/1734
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1881932A
Cited
US1899056A
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US2152901A
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US2218338A
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US2188373A
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GB482809A
Cited
US2230270A
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US2295971A
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US2337726A
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US2373077A
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US2389024A
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 |