US2443766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire-resistant dust collecting compositions
Assignee: Research Corp
•
Filing: 1945-10-24
•
Granted: 1948-06-22
•
Expires: 1965-10-24
Abstract
No abstract record available.
Inventors
- 👤 Carl W J Hedberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:07
CPC Classifications
B; B01; B01D; B01D46/00; B03; B03C; B03C3/00; B03C3/34; B03C3/40; B03C3/45; B03C3/53; C; C09; C09D; C09D5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US842636A
Cited
US1900014A
Cited
US2292097A
Cited
US2255515A
Cited
US2347031A
Cited
US2342150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-22 | 1951-12-22 | 1952-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-22 | 1955-12-22 | 1956-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-22 | 1959-12-22 | 1960-06-22 | $7700.00 | Window Closed / Lapsed |