Patent US3571852A successfully refreshed from Google Patents.
US3571852A
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Apparatus for forming corrugated foamed thermoplastic materials
Assignee: Individual
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Filing: 1967-08-28
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Granted: 1971-03-23
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Expires: 1987-08-28
Abstract
Abstract This application describes corrugated foam thermoplastic materials in which each corrugation is itself corrugated. In effect, the thermoplastic materials are corrugated in two directions and generally have a wafflelike appearance. Also described is a process for producing the double corrugated materials and suitable apparatus therefor. The corrugated materials find many uses, for instance, as a carpet underlay.
Inventors
- 👤 John Harold Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:49
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; B; B29; B29C; B29C44/00; B29C44/20; B29C44/30; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/505; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/12; B29C48/25; B29C48/30; B29C48/305; B29C48/001; B29C48/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
The combination of claim 1 wherein the slit die orifice is 0.5 inch to 60 inches long, up to 0.2 inch wide and has a land of 0.1 inch to 2 inches.
Claim 2
Dependent Claim
45 words
The combination of claim 1 wherein the length of the rollers is at least as great as the length of the slit die orifice and the diameter of the rollers, including the height of the teeth, is in the range 0.25 inch to 4 inches.
References Cited (Backward Citations)
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GB191406405A
Cited
US1440007A
Cited
GB391253A
Cited
US2771637A
Cited
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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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |