Patent US1848866A successfully refreshed from Google Patents.
Patent US2525310A successfully refreshed from Google Patents.
US2525310A
Expired / Lapsed
US
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Method of producing paper base plastic sheet material
Assignee: Raybestos Manhattan Inc
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Filing: 1944-11-30
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Granted: 1950-10-10
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Expires: 1964-11-30
Abstract
No abstract record available.
Inventors
- 👤 Izador J Novak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:05
CPC Classifications
B; B32; B32B; B32B27/00; D; D21; D21J; D21J1/00; D21J1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
THE METHOD OF PRODUCING PAPER BASE PLASTIC SHEET MATERIAL CAPABLE OF BEING HEAT MOLDED AND LAMINATED AT A LOW PRESSURE WHICH COMPRISES UNIFORMLY IMPREGNATING A CELLULOSE FIBRE WEB WITH AN AQUEOUS SOLUTION OF A WATER SOLUBLE THERMOSETTING RESIN TO PROVIDE IN THE WEB A RESIDUAL RESIN SOLIDS CONTENT OF FROM ABOUT 30% TO ABOUT 60% BY WEIGHT, DRYING THE IMPEGNATED WEB BY GRADUALLY HEATING IT TO A TEMPERATURE OF APPROXIMATELY 190* F., TO 212*F., BY CONTINUOUSLY ALTERNATING THE APPLICATION OF HEAT TO THE OPPOSED SURFACES OF THE WEB AND THEREBY ALTERNATING THE DIRECTION OF VAPOR FLOW THROUGH THE THICKNESS OF THE WEB AND TERMINATING THE HEAT DRYING WHEN THE MOISTURE CONTENT OF THE WEB HAS BEEN REDUCED TO ABOUT 4% TO 8% AND WITH THE RESIN IN THE "A" STAGE AND IN THE CONDITION OF A REDILY FUSIBLE VISCOUS PLASTIC.
Claim 2
Independent Claim
140 words
THE METHOD OF PRODUCING PAPER BASE PLASTIC SHEET MATERIAL CAPABLE OF BEING HEAT MOLDED AND LAMINATED AT A LOW PRESSURE WHICH COMPRISES UNIFORMLY IMPREGNATING A CELLULOSE FIBRE WEB WITH AN AQUEOUS SOLUTION OF A WATER SOLUBLE THERMOSETTING RESIN TO PROVIDE IN THE WEB A RESIDUAL RESIN SOLIDS CONTENT OF FROM ABOUT 30% TO ABOUT 60% BY WEIGHT, DRYING THE IMPEGNATED WEB BY GRADUALLY HEATING IT TO A TEMPERATURE OF APPROXIMATELY 190* F., TO 212*F., BY CONTINUOUSLY ALTERNATING THE APPLICATION OF HEAT TO THE OPPOSED SURFACES OF THE WEB AND THEREBY ALTERNATING THE DIRECTION OF VAPOR FLOW THROUGH THE THICKNESS OF THE WEB AND TERMINATING THE HEAT DRYING WHEN THE MOISTURE CONTENT OF THE WEB HAS BEEN REDUCED TO ABOUT 4% TO 8% AND WITH THE RESIN IN THE "A" STAGE AND IN THE CONDITION OF A REDILY FUSIBLE VISCOUS PLASTIC.
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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) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |