Patent US3169591A successfully refreshed from Google Patents.
US3169591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual drill bit apparatus
Assignee: Individual
•
Filing: 1961-11-21
•
Granted: 1965-02-16
•
Expires: 1981-11-21
Abstract
No abstract record available.
Inventors
- 👤 John D Worthington
- 👤 John L Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:32
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/64; E21B7/00; E21B7/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
DRILLING APPARATUS COMPRISING A CASING MEMBER HAVING MEANS THEREIN FOR RECEIVING DOG MEANS, AN ATTACHMENT MEMBER IN SAID CASING MEMBER COMPRISING A BODY, OPENING DEFINING MEANS IN SAID BODY, DOG MEANS IN SAID BODY EXTENDING THROUGH SAID OPENING DEFINING MEANS AND INTO SAID RECEIVING MEANS, DOWNWARDLY DIRECTED TEETH MEANS ON SAID DOG MEANS, ACTUATOR MEANS IN SAID BODY HAVING UPWARDLY DIRECTED TEETH MEANS IN ENGAGEMENT WITH THE TEETH MEANS OF SAID DOG MEANS FOR MOVING SAID DOG MEANS INWARDLY UPON AXIAL MOVEMENT OF SAID TEETH ACTUATOR MEANS, AND A BIT SECURED TO THE SAID ATTACHMENT MEMBER, WHEREBY SAID ATTACHMENT MEMBER MAY BE DRIVEN FROM SAID CASING MEMBER AND REMOVED THEREFROM.
Claim 2
Dependent Claim
110 words
DRILLING APPARATUS COMPRISING A CASING MEMBER HAVING MEANS THEREIN FOR RECEIVING DOG MEANS, AN ATTACHMENT MEMBER IN SAID CASING MEMBER COMPRISING A BODY, OPENING DEFINING MEANS IN SAID BODY, DOG MEANS IN SAID BODY EXTENDING THROUGH SAID OPENING DEFINING MEANS AND INTO SAID RECEIVING MEANS, DOWNWARDLY DIRECTED TEETH MEANS ON SAID DOG MEANS, ACTUATOR MEANS IN SAID BODY HAVING UPWARDLY DIRECTED TEETH MEANS IN ENGAGEMENT WITH THE TEETH MEANS OF SAID DOG MEANS FOR MOVING SAID DOG MEANS INWARDLY UPON AXIAL MOVEMENT OF SAID TEETH ACTUATOR MEANS, AND A BIT SECURED TO THE SAID ATTACHMENT MEMBER, WHEREBY SAID ATTACHMENT MEMBER MAY BE DRIVEN FROM SAID CASING MEMBER AND REMOVED THEREFROM.
References Cited (Backward Citations)
US1142460A
Cited
US1197882A
Cited
US1174332A
Cited
US1271275A
Cited
US1456350A
Cited
US2153815A
Cited
US2241746A
Cited
US2641444A
Cited
US2588068A
Cited
US2692116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-16 | 1968-08-17 | 1969-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-16 | 1972-08-17 | 1973-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-16 | 1976-08-17 | 1977-02-16 | $7700.00 | Window Closed / Lapsed |