US3531220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil-feed equipment operable as a single-line or double-line system
Assignee: Danfoss AS
•
Filing: 1968-08-15
•
Granted: 1970-09-29
•
Expires: 1988-08-15
Abstract
No abstract record available.
Inventors
- 👤 Arne F Enemark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:04
CPC Classifications
F; F23; F23K; F23K5/00; F23K5/02; F23K5/04; F04; F04C; F04C15/00; F04C15/0053; F23K5/14; F23K5/142
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1814101A
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US1868444A
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US2160028A
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US2229231A
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US2405061A
Cited
US2425070A
Cited
US2671409A
Cited
US2998783A
Cited
US3273513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |