US3515034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic refrigerator compressor improvement
Assignee: PHILLIP R EKLUND
•
Filing: 1968-10-03
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Granted: 1970-06-02
•
Expires: 1988-10-03
Abstract
No abstract record available.
Inventors
- 👤 Phillip R Eklund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:23
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/14; F25B31/00; Y; Y10; Y10T; Y10T74/00; Y10T74/12; Y10T74/1293; Y10T74/21; Y10T74/2142; Y10T74/2144
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) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |