Patent US2619327A successfully refreshed from Google Patents.
US2619327A
Expired / Lapsed
US
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Closed feed system for boilers
Assignee: Weir Group PLC
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Filing: 1949-03-24
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Granted: 1952-11-25
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Expires: 1969-03-24
Abstract
No abstract record available.
Inventors
- 👤 Hillier Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:08
CPC Classifications
F; F22; F22D; F22D11/00; F22D11/02; F22D11/06; B; B01; B01D; B01D19/00; B01D19/0063
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1467014A
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US1542544A
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US1596423A
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US1599334A
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GB229691A
Cited
US1629028A
Cited
GB275351A
Cited
US1991929A
Cited
GB551063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-25 | 1956-05-26 | 1956-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-25 | 1960-05-26 | 1960-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-25 | 1964-05-26 | 1964-11-25 | $7700.00 | Window Closed / Lapsed |