US2539280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam operated heater for water and other liquids
Assignee: Spirax Manufacturing Co Ltd
•
Filing: 1947-04-29
•
Granted: 1951-01-23
•
Expires: 1967-04-29
Abstract
No abstract record available.
Inventors
- 👤 Smith Herbert Alwyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:00
CPC Classifications
F; F28; F28C; F28C3/00; F28C3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US92622A
Cited
USRE22603E
Cited
US1152459A
Cited
US1243999A
Cited
GB417312A
Cited
US2212288A
Cited
GB567799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |