US3386420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Atmospheric fired boiler
Assignee: Aqua Chem Inc
•
Filing: 1966-05-19
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Granted: 1968-06-04
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Expires: 1986-05-19
Abstract
No abstract record available.
Inventors
- 👤 John C Cleaver
- 👤 Gustav A Rehm
- 👤 Glenn D Craig
- 👤 Walter J Baron
- 👤 Gething Frank
- 👤 Fred G Wiegratz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:08
CPC Classifications
F; F22; F22B; F22B21/00; F22B21/02; F22B21/04; F22B21/08; F22B21/083; F24; F24H; F24H1/00; F24H1/22; F24H1/40; F24H1/406
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) | 1971-06-04 | 1971-12-04 | 1972-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-04 | 1975-12-04 | 1976-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-04 | 1979-12-04 | 1980-06-04 | $7700.00 | Window Closed / Lapsed |