Patent US4100681A successfully refreshed from Google Patents.
US4100681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Picture frame leveling device
Assignee: Individual
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Filing: 1976-11-08
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Granted: 1978-07-18
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Expires: 1996-11-08
Abstract
Abstract An inexpensive spirit level having means for easy attachment to upper surface portions of picture frames or the like. The device comprises a transparent tape having blister-like cavities at regular intervals, a base tape affixed in face-to-face relation against one side of the transparent tape and having a pressure sensitive adhesive on the outside for attachment to a surface portion of a frame, and a liquid partially filling said cavities. Eash blister cavity has a bubble corresponding to the unfilled space which bubbles will move along the curvature of the blister, thereby indicating the relative position of the device with respect to a horizontal plane. Suitable markings on the transparent tape are provided to facilitate reading level position with respect to the horizontal plane.
Inventors
- 👤 Bruce L. Hollander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:05
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/18; G01C9/24; Y; Y10; Y10T; Y10T428/00; Y10T428/14; Y10T428/1471; Y10T428/15; Y10T428/24; Y10T428/24479; Y10T428/24562; Y10T428/24612; Y10T428/24628; Y10T428/24661; Y10T428/249921; Y10T428/249994; Y10T428/249995; Y10T428/249997
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
159 words
A spirit level device comrising: a. A flexible base member; b. a flexible transparent blister member having a longitudinal cavity of blister-like shape; c. adhesive means affixing said blister member in face-to-face engagement against one side of said base member to define therewith a closed cavity chamber; d. a liquid filling most of said chamber; e. a bubble filling the remainder of said chamber not filled by said liquid; f. means on said blister member for indicating the leveling position of said bubble in said cavity chamber; g. a coating of pressure sensitive adhesive on the outside of said base member; and h. a protective cover strip covering said pressure-sensitive adhesive on the outside of said base member; i. said blister member being formed with a plurality of longitudinal cavities equidistantly spaced therealong, said base member being substantially coextensive with said blister member, each of the closed cavity chambers thereby defined being filled with liquid and an air bubble.
Claim 2
Dependent Claim
159 words
A spirit level device comrising: a. A flexible base member; b. a flexible transparent blister member having a longitudinal cavity of blister-like shape; c. adhesive means affixing said blister member in face-to-face engagement against one side of said base member to define therewith a closed cavity chamber; d. a liquid filling most of said chamber; e. a bubble filling the remainder of said chamber not filled by said liquid; f. means on said blister member for indicating the leveling position of said bubble in said cavity chamber; g. a coating of pressure sensitive adhesive on the outside of said base member; and h. a protective cover strip covering said pressure-sensitive adhesive on the outside of said base member; i. said blister member being formed with a plurality of longitudinal cavities equidistantly spaced therealong, said base member being substantially coextensive with said blister member, each of the closed cavity chambers thereby defined being filled with liquid and an air bubble.
Claim 3
Dependent Claim
32 words
A spirit level device as defined in claim 1 including transverse zones of weakness between adjacent ones of said cavities to facilitate separation of individual ones of spirit level devices for use.
Claim 4
Dependent Claim
29 words
A spirit level device as defined in claim 2, wherein said base member and said transparent blister member are sufficiently flexible to permit rolling together thereof for compact merchandising.
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) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |