Patent US4889496A successfully refreshed from Google Patents.
Patent US3226458A successfully refreshed from Google Patents.
US3226458A
Expired / Lapsed
US
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Method and apparatus for continuously producing molded articles and sectional sheets of plastics
Assignee: Flachglas Wernberg GmbH
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Filing: 1961-12-28
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Granted: 1965-12-28
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Expires: 1981-12-28
Abstract
No abstract record available.
Inventors
- 👤 Roderich W Graeff
- 👤 Ludwig Thoma
- 👤 Karl Johann Reichl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:21
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/22; B29C53/24; B29C51/00; B29C51/14; B29C51/18; B29C51/20; B29C51/22; B29C53/28; B29C53/285; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/50; B29C70/504; B32; B32B; B32B27/00; B29K; B29K2105/00; B29K2105/06; B29K2309/00; B29K2309/08; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1016
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A METHOD OF CONTINUOUSLY MAKING TRANSFERSELY CORRUGATED SHEETS FROM A LAMINATE CONSISTING OF A LAYER OF FIBER-REINFORCED, LIQUID STATE, HEAT-HARDENABLE RESIN WRAPPED BY A FILM, COMPRISING THE STEPS OF: ADVANCING THE LAMINATE TO A ROTATING DRUM THE SURFACE OF WHICH IS CONTOURED CORRESPONDING TO THE CORRUGATIONS TO BE FORMED IN SAID LAMINATE, LAYING SAID LAMINATE AGAINST THE SAID CORRUGATIONS OF SAID DRUM, DRAWING SAID LAMINATE CONFORMINGLY AGAINST SAID DRUM BY INTERNAL VACUUM, APPLYING HEAT TO THE LAMINATE, WHILE THE LATTER IS KEPT CONFORMINGLY AGAINST SAID DRUM SOLELY BY VACUUM, UNTIL THE LAMINATE IS PARTIALLY CURED TO AN EXTENT SUCH AS TO BE DIMENSIONALLY STABLE, REMOVING SAID PARTIALLY CURED LAMINATE FROM SAID DRUM AND THEREAFTER COMPLETELY CURING AND HARDENING SAID PARTIALLY CURED LAMINATE BY APPLYING HEAT THERETO.
Claim 2
Independent Claim
126 words
A METHOD OF CONTINUOUSLY MAKING TRANSFERSELY CORRUGATED SHEETS FROM A LAMINATE CONSISTING OF A LAYER OF FIBER-REINFORCED, LIQUID STATE, HEAT-HARDENABLE RESIN WRAPPED BY A FILM, COMPRISING THE STEPS OF: ADVANCING THE LAMINATE TO A ROTATING DRUM THE SURFACE OF WHICH IS CONTOURED CORRESPONDING TO THE CORRUGATIONS TO BE FORMED IN SAID LAMINATE, LAYING SAID LAMINATE AGAINST THE SAID CORRUGATIONS OF SAID DRUM, DRAWING SAID LAMINATE CONFORMINGLY AGAINST SAID DRUM BY INTERNAL VACUUM, APPLYING HEAT TO THE LAMINATE, WHILE THE LATTER IS KEPT CONFORMINGLY AGAINST SAID DRUM SOLELY BY VACUUM, UNTIL THE LAMINATE IS PARTIALLY CURED TO AN EXTENT SUCH AS TO BE DIMENSIONALLY STABLE, REMOVING SAID PARTIALLY CURED LAMINATE FROM SAID DRUM AND THEREAFTER COMPLETELY CURING AND HARDENING SAID PARTIALLY CURED LAMINATE BY APPLYING HEAT THERETO.
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) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |