US2669393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system
Assignee: Individual
•
Filing: 1950-02-23
•
Granted: 1954-02-16
•
Expires: 1970-02-23
Abstract
No abstract record available.
Inventors
- 👤 Paul E Schleicher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:38
CPC Classifications
F; F24; F24D; F24D5/00; F24D5/06; F24D5/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US251309A
Cited
US899078A
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GB191402009A
Cited
DE705062C
Cited
US2127095A
Cited
US2206119A
Cited
US2210960A
Cited
US2237831A
Cited
US2195691A
Cited
US2480596A
Cited
US2417463A
Cited
US2465184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |