US2977472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording system
Assignee: Phillips Petroleum Co
•
Filing: 1958-02-10
•
Granted: 1961-03-28
•
Expires: 1978-02-10
Abstract
No abstract record available.
Inventors
- 👤 Kenneth V Kratochvil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:36
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/022; G; G01; G01N; G01N30/00; G01N30/02; G01N30/86; G01N30/8651
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |