US3456745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling rig and craft
Assignee: Individual
•
Filing: 1967-04-20
•
Granted: 1969-07-22
•
Expires: 1987-04-20
Abstract
No abstract record available.
Inventors
- 👤 Benjamin Peri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:52
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/02; E21B19/06; E21B15/00; E21B15/02; E21B19/002; E21B19/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2512783A
Cited
US3194313A
Cited
US3158212A
Cited
US3158211A
Cited
US3051113A
Cited
US3063507A
Cited
US3359741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |