Patent US4852319A successfully refreshed from Google Patents.
US4852319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination void drain vent chain
Assignee: Individual
•
Filing: 1988-09-19
•
Granted: 1989-08-01
•
Expires: 2008-09-19
Abstract
Abstract A combination void drain vent chair for use in the construction of voided concrete shapes, including an elongated tube connecting the interior of the void form to the exterior of the concrete shape, and including a flat flexible member surrounding the upper end of the tube which may be attached to the under surface of the void form so that the void drain vent chair may be conveniently used with void forms that are circular in cross section, as well as those that are rectangular in cross section.
Inventors
- 👤 John D. Cowan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:19
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/70; E04B5/00; E04B5/48
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
A combination void drain vent chair comprising: an elongated tube having an upper and a lower end, a flat member attached to said upper end of said tube, said flat member being spaced from said upper end of said tube and projecting laterally therefrom, and being sufficiently flexible to conform to the shape of and to be attached to a hollow tubular void form, a base member attached to said tube adjacent to said lower end of said tube.
Claim 2
Dependent Claim
79 words
A combination void drain vent chair comprising: an elongated tube having an upper and a lower end, a flat member attached to said upper end of said tube, said flat member being spaced from said upper end of said tube and projecting laterally therefrom, and being sufficiently flexible to conform to the shape of and to be attached to a hollow tubular void form, a base member attached to said tube adjacent to said lower end of said tube.
Claim 3
Dependent Claim
27 words
The combination void drain vent chair of claim 1 wherein said flat flexible member is provided with a plurality of equi-spaced holes extending through said flexible member.
Claim 4
Dependent Claim
47 words
The combination void drain vent chair of claim 1 wherein said base member is spaced from the lower end of said tube and is convexly shaped so that the periphery of said base member is substantially in the same plane as said lower end of said tube.
Claim 5
Dependent Claim
19 words
The combination void drain vent chair of claim 1 wherein said flat flexible member is integral with said tube.
Claim 6
Dependent Claim
18 words
The combination void drain vent chair of claim 1 wherein said base member is integral with said tube.
Claim 7
Dependent Claim
30 words
The combination void drain vent chair of claim 1 wherein there is shoulder-forming means integral with said tube and projecting laterally therefrom at a location spaced above said base member.
Claim 8
Dependent Claim
125 words
In a reenforced hollow concrete shape containing a void space, a combination void drain vent chair for said shape comprising an elongated tube having an upper and a lower end, said upper end extending into said void space, a flat flexible member surrounding said upper end of said tube and exterior of said void space, said flat flexible member being spaced from said upper end of said tube and projecting laterally therefrom, and being provided with a plurality of equi-spaced holes extending through said flexible member encircling said tube, and being sufficiently flexible to conform to the shape of and to be attached to a hollow tubular void form, a base member projecting laterally from said tube and encircling said lower end of said tube.
Claim 9
Dependent Claim
125 words
In a reenforced hollow concrete shape containing a void space, a combination void drain vent chair for said shape comprising an elongated tube having an upper and a lower end, said upper end extending into said void space, a flat flexible member surrounding said upper end of said tube and exterior of said void space, said flat flexible member being spaced from said upper end of said tube and projecting laterally therefrom, and being provided with a plurality of equi-spaced holes extending through said flexible member encircling said tube, and being sufficiently flexible to conform to the shape of and to be attached to a hollow tubular void form, a base member projecting laterally from said tube and encircling said lower end of said tube.
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) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |