US2836197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zone-controlled heating system
Assignee: Individual
•
Filing: 1955-08-26
•
Granted: 1958-05-27
•
Expires: 1975-08-26
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:58
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/0002; F24D19/0004; F24D19/0007; F24D19/10; F24D19/1006; F24D19/1009; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86558; Y10T137/87265; Y10T137/87338; Y10T137/87362; Y10T74/00; Y10T74/18; Y10T74/18888; Y10T74/1892
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2255292A
Cited
US1132391A
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US1262282A
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US1937597A
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US2246802A
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US2240731A
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US2357013A
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US2350431A
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US2559253A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-26 | 1961-11-25 | 1962-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-26 | 1965-11-25 | 1966-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-26 | 1969-11-25 | 1970-05-27 | $7700.00 | Window Closed / Lapsed |