US3370895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing seal for drilling bits
Assignee: Dresser Industries Inc
•
Filing: 1965-09-28
•
Granted: 1968-02-27
•
Expires: 1985-09-28
Abstract
No abstract record available.
Inventors
- 👤 Jr George A Cason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:46
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/25; F; F16; F16C; F16C33/00; F16C33/72; F16C33/76; F16C33/78; F16C2352/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2189197A
Cited
US2267994A
Cited
US2608425A
Cited
GB727135A
Cited
US2701154A
Cited
BE528972A
Cited
US2776851A
Cited
US2858149A
Cited
US2916313A
Cited
US2853223A
Cited
US2910313A
Cited
US3086782A
Cited
US3137508A
Cited
US3269738A
Cited
US3096835A
Cited
US3199878A
Cited
US3199795A
Cited
US3216513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-26 | 1971-08-28 | 1972-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-26 | 1975-08-28 | 1976-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-26 | 1979-08-28 | 1980-02-27 | $7700.00 | Window Closed / Lapsed |