US3452815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latching mechanism
Assignee: Hughes Tool Co
•
Filing: 1967-07-31
•
Granted: 1969-07-01
•
Expires: 1987-07-31
Abstract
No abstract record available.
Inventors
- 👤 Bruce J Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:24
CPC Classifications
E; E21; E21B; E21B41/00; E21B41/10; E21B33/00; E21B33/02; E21B33/03; E21B33/035; E21B33/0387; E21B43/00; E21B43/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2962096A
Cited
US3071188A
Cited
US3050139A
Cited
US3233666A
Cited
US3236302A
Cited
US3332484A
Cited
US3215454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |