US2596327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heater
Assignee: Shell Development Co
•
Filing: 1950-07-11
•
Granted: 1952-05-13
•
Expires: 1970-07-11
Abstract
No abstract record available.
Inventors
- 👤 Cox Robert
- 👤 Sipkes Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:20
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/10; F24H1/101; F24H1/102; F24H1/103
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) | 1955-05-13 | 1955-11-12 | 1956-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-13 | 1959-11-12 | 1960-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-13 | 1963-11-12 | 1964-05-13 | $7700.00 | Window Closed / Lapsed |