US2821843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquefied petroleum gas converter
Assignee: Phillips Petroleum Co
•
Filing: 1953-11-27
•
Granted: 1958-02-04
•
Expires: 1973-11-27
Abstract
No abstract record available.
Inventors
- 👤 Richard A Mengelkamp
- 👤 Lloyd B Grantham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:34
CPC Classifications
F; F02; F02M; F02M21/00; F02B; F02B43/00; F02M2700/00; F02M2700/12; F02M2700/126; Y; Y10; Y10T; Y10T137/00; Y10T137/6416; Y10T137/6579; Y10T137/7722; Y10T137/7748; Y10T137/7752
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE22556E
Cited
US2073299A
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GB475371A
Cited
US2169487A
Cited
US2248222A
Cited
US2279530A
Cited
US2359219A
Cited
US2661601A
Cited
US2696714A
Cited
US2637173A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |