Patent US3139906A successfully refreshed from Google Patents.
US3139906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual valve plug assemblies
Assignee: Rockwell Manufacturing Co
•
Filing: 1959-11-30
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Granted: 1964-07-07
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Expires: 1979-11-30
Abstract
No abstract record available.
Inventors
- 👤 Joe W Bell
- 👤 Herman H Fowler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:34
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/14; E21B34/00; E21B34/02; E21B2200/00; E21B2200/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87153
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |