US3446284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe handling apparatus
Assignee: Dresser Industries Inc
•
Filing: 1967-09-15
•
Granted: 1969-05-27
•
Expires: 1987-09-15
Abstract
No abstract record available.
Inventors
- 👤 Norman D Dyer
- 👤 Roy L Van Winkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:48
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/20; E21B19/16; E21B19/167; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53687
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2781185A
Cited
US2849212A
Cited
US3212578A
Cited
US3239016A
Cited
US3312294A
Cited
US3336991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |