US2950740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flue conduits with heat transfer elements therein
Assignee: —
•
Filing: —
•
Granted: 1960-08-30
•
Expires: 1977-08-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:45
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/40; F28F13/00; F28F13/06; F28F13/12; F28F1/42; F28F1/424; F28F1/426; F28F9/00; F28F9/22; F28F2009/222; F28F2009/228
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2290784A
Cited
US641911A
Cited
US1451272A
Cited
US1662178A
Cited
FR760701A
Cited
US2079144A
Cited
US2273157A
Cited
US2281206A
Cited
US2687747A
Cited
US2756032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-30 | 1964-02-29 | 1964-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-30 | 1968-02-29 | 1968-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-30 | 1972-02-29 | 1972-08-30 | $7700.00 | Window Closed / Lapsed |