US4028988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dowel
Assignee: Hilti AG
•
Filing: 1976-01-13
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Granted: 1977-06-14
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Expires: 1996-01-13
Abstract
Abstract A dowel for use in concrete and lightweight building bricks and boards is disclosed. The dowel comprises pressure elements, a spreading element for the pressure elements and a threaded bolt surrounded by a head element. The head element, and preferably the pressure elements and/or the spreading element are made from artificial stone, such as a fine-textured concrete or ceramic material.
Inventors
- 👤 Heinrich B. Schafers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:27
CPC Classifications
F; F16; F16B; F16B13/00; F16B13/04; F16B13/06; F16B13/063; F16B13/066; Y; Y10; Y10T; Y10T403/00; Y10T403/53; Y10T403/535; Y10T403/55; Y10T403/557
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
130 words
In a dowel comprising a threaded bolt having an inner and outer end, a head element surrounding said bolt and having two ends which face to said inner and outer ends of said bolt, respectively, a spreading element which surrounds said bolt and is connected to said bolt adjacent said inner end, said spreading element having a tapered end which faces said outer end of said bolt, at least one pressure element arranged around said bolt between said head element and said spreading element and a nut mounted on said bolt near said end of said head element facing said outer end of said bolt for shifting said pressure element on said spreading element, the improvement comprising said head element is made of artificial stone being made of artificial stone.
Claim 2
Dependent Claim
130 words
In a dowel comprising a threaded bolt having an inner and outer end, a head element surrounding said bolt and having two ends which face to said inner and outer ends of said bolt, respectively, a spreading element which surrounds said bolt and is connected to said bolt adjacent said inner end, said spreading element having a tapered end which faces said outer end of said bolt, at least one pressure element arranged around said bolt between said head element and said spreading element and a nut mounted on said bolt near said end of said head element facing said outer end of said bolt for shifting said pressure element on said spreading element, the improvement comprising said head element is made of artificial stone being made of artificial stone.
Claim 3
Dependent Claim
17 words
The improvement according to claim 1, in which said pressure element is also made of artificial stone.
Claim 4
Dependent Claim
17 words
The improvement according to claim 1, in which said spreading element is also made of artificial stone.
Claim 5
Dependent Claim
123 words
A dowel comprising a threaded bolt having an inner and an outer end, a head element surrounding said bolt and having two ends which face toward said inner and outer ends respectively of said bolt, said head element being made of artificial stone, a cone, which surrounds said bolt and is connected to said bolt adjacent said inner end, said cone having a tapered end which faces said outer end of said bolt, pressure elements arranged around said bolt between said head element and said cone, said pressure elements being made of artificial stone, and a nut mounted on said bolt near the end of said head element facing said outer end of said bolt for shifting said pressure elements on said cone.
Claim 6
Dependent Claim
123 words
A dowel comprising a threaded bolt having an inner and an outer end, a head element surrounding said bolt and having two ends which face toward said inner and outer ends respectively of said bolt, said head element being made of artificial stone, a cone, which surrounds said bolt and is connected to said bolt adjacent said inner end, said cone having a tapered end which faces said outer end of said bolt, pressure elements arranged around said bolt between said head element and said cone, said pressure elements being made of artificial stone, and a nut mounted on said bolt near the end of said head element facing said outer end of said bolt for shifting said pressure elements on said cone.
Claim 7
Dependent Claim
14 words
A dowel according to claim 4, wherein said cone is made of artificial stone.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |