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US4231383B1
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US4231383B1 - - Google Patents
Assignee: Dresser Industries Inc
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Filing: 1979-01-31
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Granted: 1984-02-14
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Expires: 1999-01-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:45
CPC Classifications
F; F02; F02M; F02M19/00; F02M19/12; F02M19/124; F02M19/08; F02M7/00; F02M7/12; F02M7/18; F02M9/00; F02M9/12; F02M9/127; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y10; Y10S; Y10S261/00; Y10S261/56; Y10S261/78; Y10T; Y10T137/00; Y10T137/0318
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |