Patent US3400249A successfully refreshed from Google Patents.
US3400249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system
Assignee: Hooker Chemical Corp
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Filing: 1966-10-26
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Granted: 1968-09-03
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Expires: 1986-10-26
Abstract
No abstract record available.
Inventors
- 👤 Mekjean Matthew
- 👤 James S Sconce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:13
CPC Classifications
F; F28; F28D; F28D20/00; F28D20/0034; F24; F24D; F24D11/00; F28D2020/0065; F28D2020/0082; Y; Y02; Y02E; Y02E60/00; Y02E60/14; Y10; Y10S; Y10S165/00; Y10S165/902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3320408A
Cited
US3299945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |