US2869175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiberizing steam ring
Assignee: American Rock Wool Corp
•
Filing: 1957-09-03
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Granted: 1959-01-20
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Expires: 1977-09-03
Abstract
No abstract record available.
Inventors
- 👤 John A Ebbinghouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:57
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)
US198057A
Cited
US328227A
Cited
GB206132A
Cited
US1948807A
Cited
US2188927A
Cited
US2646593A
Cited
US2682079A
Cited
US2785010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |