US2841962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Return apparatus for a two-stage refrigeration system
Assignee: H A PHILLIPS
•
Filing: 1957-01-23
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Granted: 1958-07-08
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Expires: 1977-01-23
Abstract
No abstract record available.
Inventors
- 👤 William V Richards
- 👤 Phillips Wayland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:49
CPC Classifications
F; F25; F25B; F25B1/00; F25B1/10; F25B2341/00; F25B2341/001; F25B2341/0014; F25B2400/00; F25B2400/13
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) | 1961-07-07 | 1962-01-06 | 1962-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-07 | 1966-01-06 | 1966-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-07 | 1970-01-06 | 1970-07-08 | $7700.00 | Window Closed / Lapsed |