US3400614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surveillance system
Assignee: Northrop Grumman Corp
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Filing: 1966-07-27
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Granted: 1968-09-10
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Expires: 1986-07-27
Abstract
No abstract record available.
Inventors
- 👤 Voss Edwin A De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:48
CPC Classifications
B; B23; B23B; B23B49/00; B23B49/001; Y; Y10; Y10T; Y10T408/00; Y10T408/13; Y10T408/14; Y10T408/16; Y10T408/165
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN A DRILLING ASSEMBLY INCORPORATING MEANS TO DETECT DRILL BREAKAGE THAT MAY OCCUR DURING A DRILLING OPERATION, THE COMBINATION COMPRISING: A DRILLING UNIT INCLUDING A MOTOR AND BIT MEMBER; A GUIDE MEMBER HAVING AN APERTURE FORMED THEREIN; SAID BIT MEMBER CONTINUOUSLY OPERATING IN SAID APERTURE DURING NORMAL OPERATIONS OF SAID UNIT; THE CLEARANCE BETWEEN SAID BIT MEMBER AND THE WALLS DEFINING SAID APERTURE BEING SUCH THAT ELECTRICAL CONTACT IS NORMALLY PROVIDED THEREBETWEEN; AND A PATH FOR ELECTRICAL CURRENT INCLUDING SAID BIT MEMBER, GUIDE MEMBER AND MOTOR CONNECTED IN SERIES WHEREBY SAID MOTOR WILL BE DEENERGIZED IN THE EVENT OF BIT MEMBER BREAKAGE.
Claim 2
Dependent Claim
102 words
IN A DRILLING ASSEMBLY INCORPORATING MEANS TO DETECT DRILL BREAKAGE THAT MAY OCCUR DURING A DRILLING OPERATION, THE COMBINATION COMPRISING: A DRILLING UNIT INCLUDING A MOTOR AND BIT MEMBER; A GUIDE MEMBER HAVING AN APERTURE FORMED THEREIN; SAID BIT MEMBER CONTINUOUSLY OPERATING IN SAID APERTURE DURING NORMAL OPERATIONS OF SAID UNIT; THE CLEARANCE BETWEEN SAID BIT MEMBER AND THE WALLS DEFINING SAID APERTURE BEING SUCH THAT ELECTRICAL CONTACT IS NORMALLY PROVIDED THEREBETWEEN; AND A PATH FOR ELECTRICAL CURRENT INCLUDING SAID BIT MEMBER, GUIDE MEMBER AND MOTOR CONNECTED IN SERIES WHEREBY SAID MOTOR WILL BE DEENERGIZED IN THE EVENT OF BIT MEMBER BREAKAGE.
References Cited (Backward Citations)
US3301100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-10 | 1972-03-11 | 1972-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-10 | 1976-03-11 | 1976-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-10 | 1980-03-11 | 1980-09-10 | $7700.00 | Window Closed / Lapsed |