US4172346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Construction panels
Assignee: Individual
•
Filing: 1977-12-13
•
Granted: 1979-10-30
•
Expires: 1997-12-13
Abstract
Abstract A construction panel suitable for flat roofs, walls, floors and the like. The panel is preformed employing a sheet steel member embedded therein having in addition intersecting reinforcement of steel bars. The panel is of cementitious material bent on both sides and formed in a U-shape.
Inventors
- 👤 Ichio Kuroiwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:39
CPC Classifications
E; E04; E04B; E04B5/00; E04B5/02; E04B5/04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
An improved pre-formed construction panel made of cementitious material having a reinforcement system, employing a sheet metal water-resisting layer of steel is embedded and attached to said cementitious material; said improvement comprising disposing said layer with respect to said cementitious material whereby transverse edge portions of said layer extend outside of said material and its longitudinal sides are bent into a U-shaped as seen in the transverse direction, and said panel reinforcement means disposed upon the entire surface of said layer of steel having strengthened joints exhibiting water-tightness by welding said U-shaped sheet metal at respective abutting edge portions forming respective joints in the longitudinal direction and providing a cementitious cap upon the joint to thereby form a monolithic construction panel.
Claim 2
Dependent Claim
121 words
An improved pre-formed construction panel made of cementitious material having a reinforcement system, employing a sheet metal water-resisting layer of steel is embedded and attached to said cementitious material; said improvement comprising disposing said layer with respect to said cementitious material whereby transverse edge portions of said layer extend outside of said material and its longitudinal sides are bent into a U-shaped as seen in the transverse direction, and said panel reinforcement means disposed upon the entire surface of said layer of steel having strengthened joints exhibiting water-tightness by welding said U-shaped sheet metal at respective abutting edge portions forming respective joints in the longitudinal direction and providing a cementitious cap upon the joint to thereby form a monolithic construction panel.
Claim 3
Dependent Claim
23 words
An improved pre-formed construction panel in accordance with claim 1, wherein: said cementitious material consists of lightweight concrete comprising a blended expansive admixture.
Claim 4
Dependent Claim
18 words
An improved pre-formed construction panel in accordance with claim 1, wherein: said cementitious material consists of asbestos cement.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-29 | 1983-04-30 | 1983-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-29 | 1987-04-30 | 1987-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-29 | 1991-04-30 | 1991-10-30 | $7700.00 | Window Closed / Lapsed |