Patent US3856095A successfully refreshed from Google Patents.
Patent US4921383A successfully refreshed from Google Patents.
US4921383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic expansible plug
Assignee: Fischerwerke Artur Fischer GmbH and Co KG
•
Filing: 1989-05-15
•
Granted: 1990-05-01
•
Expires: 2009-05-15
Abstract
Abstract An expansible plug made of a plastic material located in a drilled hole in masonry for receiving a fastening screw and comprising expansible legs having at the expansible end thereof outer notches of a reduced depth.
Inventors
- 👤 Artur Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:00
CPC Classifications
F; F16; F16B; F16B13/00; F16B13/12; F16B13/124
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
An expansible plug made of a plastic or similar material to be inserted into a drilled hole in masonry for receiving a fastening screw, said expansible plug comprising a tapered bore for receiving the fastening screw; expansible legs having an expansible end portion; and alternate teeth and notches on outer surfaces of said expansible legs, said notches including first notches located at said expansible end portion of said expansible plug and having a first depth, and second notches located on a remaining portion of said expansible legs and having a second depth, the first depth of said first notches being smaller than the second depth of said other notches to increase the thickness of the material at the expansible end portion of the expansible plug and to increase expansion pressure in the drilled hole in the vicinity of the end portion.
Claim 2
Dependent Claim
141 words
An expansible plug made of a plastic or similar material to be inserted into a drilled hole in masonry for receiving a fastening screw, said expansible plug comprising a tapered bore for receiving the fastening screw; expansible legs having an expansible end portion; and alternate teeth and notches on outer surfaces of said expansible legs, said notches including first notches located at said expansible end portion of said expansible plug and having a first depth, and second notches located on a remaining portion of said expansible legs and having a second depth, the first depth of said first notches being smaller than the second depth of said other notches to increase the thickness of the material at the expansible end portion of the expansible plug and to increase expansion pressure in the drilled hole in the vicinity of the end portion.
Claim 3
Dependent Claim
17 words
An expansible plug according to claim 1, further comprising a longitudinal slot extending between said expansible legs.
Claim 4
Dependent Claim
40 words
An expansible plug according to claim 2, wherein said expansible end portion has an expansible end, the depth of successive notches continuously decreasing towards said expansible end at least over a portion of a total length of said expansible legs.
Claim 5
Dependent Claim
27 words
An expansible plug according to claim 2, wherein said tapering bore has an apex located in a region of said expansible legs which contains the first notches.
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) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |