Patent US3741857A successfully refreshed from Google Patents.
US3741857A
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Composite light weight board and manufacture thereof
Assignee: Asahi Kasei Corp
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Filing: 1971-11-19
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Granted: 1973-06-26
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Expires: 1991-11-19
Abstract
Abstract A composite panel member of thermoplastic resin comprising three constituents fused together at their mutually contacting points, the two constituents of which consist of two comb-sectioned sheets coupled with each other in a substantially opposite and in a longitudinally offset way, the remaining constituent consisting of an intermediate sheet arranged between the two comb members and in a zigzag and saw tooth like manner between the said both.
Inventors
- 👤 T Kakutani
- 👤 T Hirata
- 👤 H Innami
- 👤 S Matsuda
- 👤 K Inagaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:11
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/54; E04C2/543; B; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/20; B29C65/2007; B29C65/203; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/114; B29C66/40; B29C66/41; B29C66/43; B29C66/438; B29C66/50; B29C66/51; B29C66/54; B29C66/80; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413; E04C2/30; E04C2/32; E04C2/34; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/11; B29C48/15; B29C66/541; B29C66/5412; B29C66/70; B29C66/71; B29L; B29L2007/00; B29L2007/001; B29L2007/002; B29L2022/00; B29L2022/005; B29L2024/00; B29L2024/006; B29L2031/00; B29L2031/10; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1016; Y10T156/1025; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24661; Y10T428/24744
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
17 words
A process fo the manufacture of a composite, hollow and light weight web, comprising the steps of:
Claim 2
Dependent Claim
7 words
quenching these comb sheets directly upon extruded;
Claim 3
Dependent Claim
12 words
extruding an intermediate sheet of thermoplastic material from a separate orifice opening;
Claim 4
Dependent Claim
25 words
A process as claimed in claim 2, further comprising a reheating step for the quenched comb sheets and before preforming thereof with the intermediate sheet.
Claim 5
Dependent Claim
38 words
arranging the comb sheets in a longitudinally offset way to each other so as to arrange the comb teeth of the first comb sheet to occupy alternate positions relative to the comb teeth of the second comb sheet;
Claim 6
Dependent Claim
49 words
uniting the first and second comb sheets with said intermediate sheet into a rigid composite hollow web by fusing together at their contacting points among these three constituting components, said intermediate sheet being arranged so as to describe a saw tooth configuration between the first and second comb sheets.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |