US2469309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preventing ice formation on surfaces
Assignee: Shell Development Co
•
Filing: 1943-09-20
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Granted: 1949-05-03
•
Expires: 1963-09-20
Abstract
No abstract record available.
Inventors
- 👤 Rupert C Morris
- 👤 Edward C Shokal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:10
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/18; Y; Y10; Y10T; Y10T428/00; Y10T428/8305
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1565323A
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GB336739A
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US2017593A
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US1926766A
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US2094564A
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US2091395A
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US2078534A
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GB481674A
Cited
US2219006A
Cited
US2233185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-02 | 1952-11-01 | 1953-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-02 | 1956-11-01 | 1957-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-02 | 1960-11-01 | 1961-05-03 | $7700.00 | Window Closed / Lapsed |