US2996292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gravity-fed combustion equipment applying crossfeed ignition principle
Assignee: Individual
•
Filing: 1958-06-12
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Granted: 1961-08-15
•
Expires: 1978-06-12
Abstract
No abstract record available.
Inventors
- 👤 Ernst G Graf
- 👤 Charles N Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:50
CPC Classifications
F; F23; F23B; F23B10/00; B; B01; B01J; B01J8/00; B01J8/08; B01J8/12; C; C22; C22B; C22B1/00; C22B1/14; F23B50/00; F23B50/02; F23B50/04; F23B7/00; F23B80/00; F23B80/04; F23B90/00; F23B2700/00; F23B2700/011; F23B2700/023
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) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |