Patent US3537272A successfully refreshed from Google Patents.
US3537272A
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US
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Expansion valve control including plural sensors
Assignee: HALL THERMOTANK INTERN Ltd
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Filing: 1968-08-22
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Granted: 1970-11-03
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Expires: 1988-08-22
Abstract
No abstract record available.
Inventors
- 👤 Richard Thomas Hales
- 👤 Brian Cecil Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:59
CPC Classifications
F; F25; F25B; F25B41/00; F25B41/30; F25B41/31; F25B41/34; F25B41/345; F25B41/347; F25B2600/00; F25B2600/25; F25B2600/2513; Y; Y02; Y02B; Y02B30/00; Y02B30/70
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) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |