US3931098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing webs, panels or sandwich elements of foam plastics reinforced with rovings
Assignee: Bayer AG
•
Filing: 1974-02-12
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Granted: 1976-01-06
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Expires: 1994-02-12
Abstract
Abstract Means for producing fiber-reinforced foam plastic webs, panels, sandwich panels and the like from continuous rovings and a foam reaction mixture. Rovings are incorporated into a foam product or core by means of an air nozzle coupled to and adjustable in its position to the nozzle of a mixing head for ejecting the foam reaction mixture.
Inventors
- 👤 Peter Herweg
- 👤 Franz Prager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:43
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29K; B29K2105/00; B29K2105/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A method for producing a continuous fiber reinforced foam plastic web comprising: a. directing a continuous roving onto a moving support means by means of an air nozzle wherein the roving is deposited in the form of random loops and the angle between the air nozzle and the moving support is used to control the form of the loops formed in the roving as it is deposited; b. depositing a foamable reaction mixture onto said support means either before or after the deposition of said roving; c. allowing said mixture to foam and permeate said roving; and d. using the relative sequence and time lag between the mixture deposition and the roving deposition to control the ultimate position of the roving in the foamed web and to insure that the distribution of the roving is three dimensional such that the roving provides reinforcement for the web.
Claim 2
Independent Claim
146 words
A method for producing a continuous fiber reinforced foam plastic web comprising: a. directing a continuous roving onto a moving support means by means of an air nozzle wherein the roving is deposited in the form of random loops and the angle between the air nozzle and the moving support is used to control the form of the loops formed in the roving as it is deposited; b. depositing a foamable reaction mixture onto said support means either before or after the deposition of said roving; c. allowing said mixture to foam and permeate said roving; and d. using the relative sequence and time lag between the mixture deposition and the roving deposition to control the ultimate position of the roving in the foamed web and to insure that the distribution of the roving is three dimensional such that the roving provides reinforcement for the web.
References Cited (Backward Citations)
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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) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |