Patent US2887470A successfully refreshed from Google Patents.
← Back to Patent Explorer
US2887470A Expired / Lapsed US ⏱️ 0.0 years remaining

Process and apparatus for separating and purifying condensations products

Assignee: SNIA Viscosa SpA
•
Filing: 1954-11-22
•
Granted: 1959-05-19
•
Expires: 1974-11-22
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

No abstract record available.

Inventors

  • 👤 Muench Werner
  • 👤 Crosio Enrico

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 23:33
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/46

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 177 words
A METHOD OF REMOVING WATER SOLUBLE IMPURITIES FORM RAW MONOMERIC MATERIALS FOR THE PREPARATION OF SYNTHETIC LINEAR HIGH MOLECULAR POLYAMIDES, COMPRISING THE STEPS OF INTRODUCING A MIXTURE OF SAID RAW MONOMRIC MATERIALS AND WATER, IN A VERTICALLY ELONGATED REACTION SPACE, WEIGHT OF WATER, IN A VERTICALLY ELONGATED REACTION SPACE, HEATING SAID SPACE TO TEMPERATURES ABOVE 180*C. CONCURRENTLY MAINTAINING IN SAID SPACE A PRESSURE SUFFICIENT TO PREVENT THE WATER FROM BOILING CONTINUING SAID HEATING WHILE MAINTAINING THE LOWERMOST ZONE OF SAID SPACE AT A TEMPERATURE LOWER THAN THOSE OBTAINING IN THE BALANCE OF SAID SPACE AND WHILE MAINTAINING THE WATER IN THE LIQUID STATE, UNTIL A LOW MOLECULAR WEIGHT POLYAMIDE HAS FORMED, SAID POLYAMIDE AND SAID WATER CONTAINING THE WATER SOLUBLE IMPURITIES FORMING TWO DISTINCT LAYERS, THE POLYAMIDE LAYER BEING OF GREATER DENSITY, POSITIONED IN SAID LOWERMOST ZONE OF SAID SPACE, AND SUBTANTIALLY FREE FROM WATER SOLUBLE IMPURITIES, THE WATER LAYER BEING SUPERIMPOSED THEREON, AND THEREAFTER SEPARATING SAID WATER CONTAINING SAID WATER SOLUBLE IMPURITIES FROM SAID LOW MOLECULAR WEIGHT POLYAMIDE AND DISCHARGING THE LATTER FROM SAID REACTION SPACE.
Claim 2
Independent Claim 177 words
A METHOD OF REMOVING WATER SOLUBLE IMPURITIES FORM RAW MONOMERIC MATERIALS FOR THE PREPARATION OF SYNTHETIC LINEAR HIGH MOLECULAR POLYAMIDES, COMPRISING THE STEPS OF INTRODUCING A MIXTURE OF SAID RAW MONOMRIC MATERIALS AND WATER, IN A VERTICALLY ELONGATED REACTION SPACE, WEIGHT OF WATER, IN A VERTICALLY ELONGATED REACTION SPACE, HEATING SAID SPACE TO TEMPERATURES ABOVE 180*C. CONCURRENTLY MAINTAINING IN SAID SPACE A PRESSURE SUFFICIENT TO PREVENT THE WATER FROM BOILING CONTINUING SAID HEATING WHILE MAINTAINING THE LOWERMOST ZONE OF SAID SPACE AT A TEMPERATURE LOWER THAN THOSE OBTAINING IN THE BALANCE OF SAID SPACE AND WHILE MAINTAINING THE WATER IN THE LIQUID STATE, UNTIL A LOW MOLECULAR WEIGHT POLYAMIDE HAS FORMED, SAID POLYAMIDE AND SAID WATER CONTAINING THE WATER SOLUBLE IMPURITIES FORMING TWO DISTINCT LAYERS, THE POLYAMIDE LAYER BEING OF GREATER DENSITY, POSITIONED IN SAID LOWERMOST ZONE OF SAID SPACE, AND SUBTANTIALLY FREE FROM WATER SOLUBLE IMPURITIES, THE WATER LAYER BEING SUPERIMPOSED THEREON, AND THEREAFTER SEPARATING SAID WATER CONTAINING SAID WATER SOLUBLE IMPURITIES FROM SAID LOW MOLECULAR WEIGHT POLYAMIDE AND DISCHARGING THE LATTER FROM SAID REACTION SPACE.

References Cited (Backward Citations)

US2163636A Cited
US2241321A Cited
US2375256A Cited
US2326326A Cited
US2562796A Cited
FR994244A Cited
US2714101A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1962-05-18 1962-11-17 1963-05-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1966-05-18 1966-11-17 1967-05-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1970-05-18 1970-11-17 1971-05-19 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag