Patent US2428249A successfully refreshed from Google Patents.
US2428249A
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Apparatus for puffing slag
Assignee: INSULATION PRODUCTS Ltd
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Filing: 1944-02-04
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Granted: 1947-09-30
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Expires: 1964-02-04
Abstract
No abstract record available.
Inventors
- 👤 John C K Stuart
- 👤 Albert H Vanderburgh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:45
CPC Classifications
C; C21; C21B; C21B3/00; C21B3/04; C21B3/06; C21B2400/00; C21B2400/02; C21B2400/022; C21B2400/024; Y; Y02; Y02W; Y02W30/00; Y02W30/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB143500A
Cited
US1458858A
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US2067312A
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US2116663A
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US2212962A
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US2261022A
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US2215223A
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US2305516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-29 | 1951-03-31 | 1951-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-29 | 1955-03-31 | 1955-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-29 | 1959-03-31 | 1959-09-30 | $7700.00 | Window Closed / Lapsed |