US4923733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible form sheet
Assignee: Individual
•
Filing: 1989-01-26
•
Granted: 1990-05-08
•
Expires: 2009-01-26
Abstract
Abstract A flexible form sheet is described, which is used for producing plaster cavity floors. The sheet has regularly distributed, leg-like bulges. The bulges are interconnected by horizontal sheet surfaces. Increased flexibility areas are located between the bulges, and are preferably deformed. They are appropriately constructed as zig-zag or concertina-like strips concentrically surrounding the bulges. This provides an increase in the vertical reciprocal mobility of the bulges, so that on applying the plaster, the form sheet can adapt to unevennesses of the underfloor.
Inventors
- 👤 Donald Herbst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:04
CPC Classifications
E; E04; E04B; E04B5/00; E04B5/48; E04F; E04F15/00; E04F15/12; E04F15/123; F; F24; F24D; F24D5/00; F24D5/06; F24D5/10; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24174; Y10T428/24182; Y10T428/24479; Y10T428/24628; Y10T428/24669; Y10T428/24678
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
51 words
A flexible form sheet for use in producing a plaster cavity floor, comprising a sheet with regularly distributed bulges and defined increased flexibility areas between the bulges as a result of a modification to bending behavior of the sheet, wherein the increased flexibility areas are deformed areas concentrically surrounding the bulges.
Claim 2
Dependent Claim
51 words
A flexible form sheet for use in producing a plaster cavity floor, comprising a sheet with regularly distributed bulges and defined increased flexibility areas between the bulges as a result of a modification to bending behavior of the sheet, wherein the increased flexibility areas are deformed areas concentrically surrounding the bulges.
Claim 3
Dependent Claim
16 words
The sheet according to claim 1, wherein the deformed areas are constructed as zig-zag concertina-like strips.
Claim 4
Dependent Claim
19 words
The sheet according to claim 1, further comprising sheet-reinforcing deformations between the bulges and outside the increased flexibility areas.
Claim 5
Dependent Claim
14 words
The sheet according to claim 3, wherein the sheet-reinforcing deformations are constructed as beads.
Claim 6
Dependent Claim
24 words
The sheet according to claim 3, wherein at least part of the sheet-reinforcing deformations are arranged in cruciform manner between four increased flexibility areas.
Claim 7
Dependent Claim
13 words
The sheet according to claim 1, wherein the sheet is made from plastic.
Claim 8
Dependent Claim
32 words
The sheet according to claim 1, wherein a process for the production of a form sheet comprises the step of deforming increased flexibility areas in a single operation with construction of bulges.
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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) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |