US2689373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming mineral wool
Assignee: CHARLES RICHARDSON Corp
•
Filing: 1952-06-25
•
Granted: 1954-09-21
•
Expires: 1972-06-25
Abstract
No abstract record available.
Inventors
- 👤 Charles D Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:29
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/04; C03B37/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US65339A
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US687524A
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US1051844A
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US1834687A
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US2318244A
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US2328714A
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US2470569A
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US2587710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |