Patent US3816864A successfully refreshed from Google Patents.
US3816864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screwdriver level
Assignee: Individual
•
Filing: 1973-02-05
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Granted: 1974-06-18
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Expires: 1993-02-05
Abstract
Abstract A screwdriver having a transparent handle and a plurality of bubble-level cavities spaced apart within said handle and at different angles to the longitudinal axis of the screwdriver. The tool is further characterized by a rest member slidably mounted upon the shank of the screwdriver and adapted to be locked in an inoperative position against the handle and an operative position remote from the handle.
Inventors
- 👤 A Cotter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:18
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/18; G01C9/24; G01C9/26; G01C9/28; B; B25; B25F; B25F1/00; Y; Y10; Y10S; Y10S273/00; Y10S273/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
A screwdriver tool comprising: a. an elongated screwdriver handle of transparent material having first and second ends, b. a screwdriver shank of uniform cross-section having a blade at one end and an opposite end fixed in said second end of said handle, c. a plurality of elongated cavities within said handle, each cavity partially containing liquid to form a bubble therein, d. one of said cavities being parallel to the longitudinal axis of said handle, and e. the longitudinal axis of each of said other cavities being at an angle to the longitudinal axis of said handle different from the angle of any other cavity.
Claim 2
Dependent Claim
105 words
A screwdriver tool comprising: a. an elongated screwdriver handle of transparent material having first and second ends, b. a screwdriver shank of uniform cross-section having a blade at one end and an opposite end fixed in said second end of said handle, c. a plurality of elongated cavities within said handle, each cavity partially containing liquid to form a bubble therein, d. one of said cavities being parallel to the longitudinal axis of said handle, and e. the longitudinal axis of each of said other cavities being at an angle to the longitudinal axis of said handle different from the angle of any other cavity.
Claim 3
Dependent Claim
57 words
The invention according to claim 1 in which said handle has a uniform cross-section, a rest member of the same cross-section as said handle, a hole in said rest member slidably receiving said shank so that said rest member is in axial alignment with said handle, said rest member being slidable between said handle and said blade.
Claim 4
Dependent Claim
30 words
The invention according to claim 2 further comprising means for securing said rest member in an inoperative position flush against said handle and an operative position remote from said handle.
Claim 5
Dependent Claim
70 words
The invention according to claim 3 in which said securing means comprises a ball detent in said rest member projecting into said hole and being biased against said shank, a first locking recess in said shank adjacent said handle for receiving said ball detent, and a second locking recess in said shank for receiving said ball detent, said second recess being in alignment with and spaced from said first recess.
Claim 6
Dependent Claim
25 words
The invention according to claim 1 in which the angle of one of said other cavities is 90* to the longitudinal axis of said handle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |