US3401920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Space heating device
Assignee: Lisk-Savory Corp
•
Filing: 1966-06-27
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Granted: 1968-09-17
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Expires: 1986-06-27
Abstract
No abstract record available.
Inventors
- 👤 John G Berkhoudt
- 👤 John M Melisz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:45
CPC Classifications
F; F23; F23C; F23C99/00; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0488; F24H9/00; F24H9/18; F24H9/1854; F24H9/1877; F24H9/1881; F23C2700/00; F23C2700/02; F23C2700/023; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-17 | 1972-03-18 | 1972-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-17 | 1976-03-18 | 1976-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-17 | 1980-03-18 | 1980-09-17 | $7700.00 | Window Closed / Lapsed |