US3473444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston assembly particularly for refrigeration compressors
Assignee: Danfoss AS
•
Filing: 1967-07-06
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Granted: 1969-10-21
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Expires: 1987-07-06
Abstract
No abstract record available.
Inventors
- 👤 Hans Ulrik Leffers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:06
CPC Classifications
F; F16; F16J; F16J1/00; F16J1/10; F16J1/14; F16J1/22; F04; F04B; F04B39/00; F04B39/0005; F16J1/005; F16J1/006; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2142; Y10T74/2162
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE308193C
Cited
FR965449A
Cited
US1386144A
Cited
US1878566A
Cited
US1784837A
Cited
US3241226A
Cited
US3286535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |