US3906072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding process
Assignee: Trane US Inc
•
Filing: 1973-10-01
•
Granted: 1975-09-16
•
Expires: 1993-10-01
Abstract
Abstract A method of compression molding sanitary ware from thermosetting resins such as melamine. The mold is configured to a minimum draft angle for the most steeply sloped wall, and the resin is charged into the mold in the form of one or more thickened cakes of agglomerated resin particles. The mold configuration and method of charging are such that the steeply sloped mold surfaces achieve a relatively high pressure on the plastic so as to minimize surface porosity. During closing movement of the mold the cake of resin is broken and caused to flow upwardly to form a integral deck portion as well as flow downwardly against the steeply sloped surface of the recieving mold.
Inventors
- 👤 Thomas W Haas
- 👤 Richard L Mach
- 👤 Edward Studley
- 👤 Robert Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:53
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; B29C43/32; B29C43/52; B29K; B29K2105/00; B29K2105/25; B29K2105/253; B29L; B29L2031/00; B29L2031/769; B29L2031/7698; Y; Y10; Y10S; Y10S264/00; Y10S264/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
217 words
A SINGLE STROKE COMPRESSION MOLDING PROCESS ADAPTED FOR THE PRODUCTION OF A NONPOROUS PLUMBING FIXTURE, SUCH AS A LAVATORY HAVING A DEEP DISHED BOWL SECTION AND A CONNECTING PERIPHERAL DECK SECTION, THE DEEP DISHED BOWL SECTION HAVING A STEEP WALL FORMING AN ACUTE ANGLE OF ABOUT 18* WITH THE VERTICAL PLANE, THE COMPRESSION MOLD HAVING TWO SEGMENTS A CHARGE-RECEIVING MOLDING SEGMENT AND A COACTING MATING MOLD SEGMENT, THE PROCESS CONSISTING ESSENTIALLY OF: CHARGING THE RECEIVING MOLD SEGMENT WITH A SINGLE FLATTENED CAKE-LIKE MASS OF THERMOSETTING RESIN CONSISTING OF POROUS CELLULOSE FILLED MELAMINE MOLDING POWDER IN THE FORM OF A CAKE WHICH IS PREHEATED TO A TEMPERATURE OF ABOUT 200*F BY POSITIONING THE CAKE ON ITS LOWER EDGE NEAR THE CENTER AND BOTTOM OF THE RECEIVING MOLD SEGMENT AND ITS OPPOSITE UPPER EDGE EXTENDING SUBSTANTIALLY ABOVE THE RECEIVING MOLD SEGMENT, THE CAKE PORTION INCLINED TO A WALL OF THE RECEIVING MOLD SEGMENT AND FORMING THE STEEP WALL OF THE DISHED BOWL SECTION WHILE THE PORTION OF THE MASS PROJECTING ABOVE THE RECEIVING MOLD SEGMENT SERVING AS THE CHARGE FOR THE DECK SECTION, CLOSING THE MOLD BY MOVING THE CO-ACTING MATING MOLD SEGMENT INTO THE CHARGE-RECEIVING MOLD SEGMENT AND SUBJECTING THE MASS OF THERMOSETTING RESIN TO PRESSURE OF ABOUT 4,000 P.S.I. AND HEAT AT A TEMPERATUE OF ABOUT 300*
Claim 2
Dependent Claim
217 words
A SINGLE STROKE COMPRESSION MOLDING PROCESS ADAPTED FOR THE PRODUCTION OF A NONPOROUS PLUMBING FIXTURE, SUCH AS A LAVATORY HAVING A DEEP DISHED BOWL SECTION AND A CONNECTING PERIPHERAL DECK SECTION, THE DEEP DISHED BOWL SECTION HAVING A STEEP WALL FORMING AN ACUTE ANGLE OF ABOUT 18* WITH THE VERTICAL PLANE, THE COMPRESSION MOLD HAVING TWO SEGMENTS A CHARGE-RECEIVING MOLDING SEGMENT AND A COACTING MATING MOLD SEGMENT, THE PROCESS CONSISTING ESSENTIALLY OF: CHARGING THE RECEIVING MOLD SEGMENT WITH A SINGLE FLATTENED CAKE-LIKE MASS OF THERMOSETTING RESIN CONSISTING OF POROUS CELLULOSE FILLED MELAMINE MOLDING POWDER IN THE FORM OF A CAKE WHICH IS PREHEATED TO A TEMPERATURE OF ABOUT 200*F BY POSITIONING THE CAKE ON ITS LOWER EDGE NEAR THE CENTER AND BOTTOM OF THE RECEIVING MOLD SEGMENT AND ITS OPPOSITE UPPER EDGE EXTENDING SUBSTANTIALLY ABOVE THE RECEIVING MOLD SEGMENT, THE CAKE PORTION INCLINED TO A WALL OF THE RECEIVING MOLD SEGMENT AND FORMING THE STEEP WALL OF THE DISHED BOWL SECTION WHILE THE PORTION OF THE MASS PROJECTING ABOVE THE RECEIVING MOLD SEGMENT SERVING AS THE CHARGE FOR THE DECK SECTION, CLOSING THE MOLD BY MOVING THE CO-ACTING MATING MOLD SEGMENT INTO THE CHARGE-RECEIVING MOLD SEGMENT AND SUBJECTING THE MASS OF THERMOSETTING RESIN TO PRESSURE OF ABOUT 4,000 P.S.I. AND HEAT AT A TEMPERATUE OF ABOUT 300*
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |