US2828936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion valves for refrigeration plants
Assignee: J&E Hall Ltd
•
Filing: 1954-07-30
•
Granted: 1958-04-01
•
Expires: 1974-07-30
Abstract
No abstract record available.
Inventors
- 👤 Hales Richard Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:13
CPC Classifications
F; F25; F25B; F25B41/00; F25B41/30; F25B41/31; F25B41/34; F25B41/345; Y; Y02; Y02B; Y02B30/00; Y02B30/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US230173A
Cited
GB190716513A
Cited
US1409127A
Cited
US1507582A
Cited
US1709095A
Cited
US1822668A
Cited
US2631612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |