US3447616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drills
Assignee: ZIGMUND E GRANAT
•
Filing: 1966-12-29
•
Granted: 1969-06-03
•
Expires: 1986-12-29
Abstract
No abstract record available.
Inventors
- 👤 Zigmund E Granat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:28
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/58; E21B10/44; E21B10/445; E21B10/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191218443A
Cited
US1902885A
Cited
GB636768A
Cited
GB657432A
Cited
US2502128A
Cited
US2673716A
Cited
US2673717A
Cited
US2902260A
Cited
US3117637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |