US2619942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water wall boiler with undulating flue
Assignee: Gustavsbergs Fabriker AB
•
Filing: 1949-02-01
•
Granted: 1952-12-02
•
Expires: 1969-02-01
Abstract
No abstract record available.
Inventors
- 👤 Rydberg John Anders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:01
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/0005; F24H9/001; F24H9/0015; F24H1/00; F24H1/22; F24H1/24; F24H1/26; F24H1/28; F24H1/38; F24H1/44; F24H2230/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US948213A
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US1091581A
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US1198838A
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US1360980A
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US2053590A
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US1948539A
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US1974177A
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US2247849A
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US2399046A
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US2345559A
Cited
US2405284A
Cited
US2463958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |