US2488779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic changeover regulator and indicator device
Assignee: Phillips Petroleum Co
•
Filing: 1943-12-27
•
Granted: 1949-11-22
•
Expires: 1963-12-27
Abstract
No abstract record available.
Inventors
- 👤 Andrew R Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:15
CPC Classifications
F; F17; F17C; F17C13/00; F17C13/04; F17C13/045; Y; Y10; Y10T; Y10T137/00; Y10T137/4673; Y10T137/469; Y10T137/7722; Y10T137/7781; Y10T137/7782; Y10T137/7793; Y10T137/7795; Y10T137/7832; Y10T137/8158; Y10T137/8175; Y10T137/8593; Y10T137/87571; Y10T137/87676; Y10T137/87684; Y10T137/87692
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1706230A
Cited
US1844814A
Cited
US1962027A
Cited
US2093003A
Cited
US2197144A
Cited
US2223137A
Cited
US2351135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |