Patent US3402891A successfully refreshed from Google Patents.
US3402891A
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US
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Furnace pump and oil burner circuit
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1965-08-20
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Granted: 1968-09-24
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Expires: 1985-08-20
Abstract
No abstract record available.
Inventors
- 👤 Hubert M Clark
- 👤 Gilbert H Drutchas
- 👤 Becker Philipp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:45
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/18; F04C14/22; F04C14/223; F04B; F04B1/00; F04B1/04; F04B1/10; F04B1/107; F04B1/1071; F04B23/00; F04B23/04; F04B23/08; F04B23/10; F04B49/00; F04B49/007; F04C14/02; F04C14/24; F04C14/26; F04C2/00; F04C2/30; F04C2/34; F04C2/344; F04C2/3441; F04C2/3445; F23; F23K; F23K5/00; F23K5/02; F23K5/04; F23N; F23N1/00
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |