US3306813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulp molding, method and apparatus
Assignee: Diamond International Corp
•
Filing: 1964-06-16
•
Granted: 1967-02-28
•
Expires: 1984-06-16
Abstract
No abstract record available.
Inventors
- 👤 Richard F Reifers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:23
CPC Classifications
D; D21; D21J; D21J5/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
IN A METHOD OF PULP MOLDING COMPRISING CONTACTING A MOLDING SURFACE WITH A PULP SLURRY, DEPOSITING THE PULP ON THE MOLDING SURFACE, REMOVING THE DEPOSIT AND MOLD FROM THE SLURRY, AND REMOVING THE DEPOSIT FROM THE MOLD, THE IMPROVEMENT COMPRISING DEPOSITING A PORTION OF PULP IN A PLURALITY OF UNDERCUT POSITIONS OF SAID MOLD AT PERIPHERAL SECTIONS OF SAID DEPOSIT DURING THE DEPOSITION TO FORM A PLURALITY OF PROJECTIONS AND REMOVING THE DEPOSIT FROM THE MOLD BY APPLYING DIFFERENTIAL PRESSURE TO SAID DEPOSIT TO DEFORM SAID PROJECTIONS AT SAID PERIPHERAL SECTIONS AND TO FORCE SAID PROJECTIONS AT SAID PERIPHERAL SECTIONS OUT OF SAID UNDERCUT PORTIONS AND PROVIDE AN EDGE ESSENTIALLY FREE OF FLASH.
Claim 2
Dependent Claim
113 words
IN A METHOD OF PULP MOLDING COMPRISING CONTACTING A MOLDING SURFACE WITH A PULP SLURRY, DEPOSITING THE PULP ON THE MOLDING SURFACE, REMOVING THE DEPOSIT AND MOLD FROM THE SLURRY, AND REMOVING THE DEPOSIT FROM THE MOLD, THE IMPROVEMENT COMPRISING DEPOSITING A PORTION OF PULP IN A PLURALITY OF UNDERCUT POSITIONS OF SAID MOLD AT PERIPHERAL SECTIONS OF SAID DEPOSIT DURING THE DEPOSITION TO FORM A PLURALITY OF PROJECTIONS AND REMOVING THE DEPOSIT FROM THE MOLD BY APPLYING DIFFERENTIAL PRESSURE TO SAID DEPOSIT TO DEFORM SAID PROJECTIONS AT SAID PERIPHERAL SECTIONS AND TO FORCE SAID PROJECTIONS AT SAID PERIPHERAL SECTIONS OUT OF SAID UNDERCUT PORTIONS AND PROVIDE AN EDGE ESSENTIALLY FREE OF FLASH.
Claim 3
Dependent Claim
57 words
IN A MOLD FOR USE IN PULP MOLDING COMPRISING A PERMEABLE MOLDING SURFACE AND A HOLLOW INTERIOR ADJACENT SAID MOLDING SURFACE TO TRANSMIT FLUID PRESSURE, THE IMPROVEMENT COMPRISING MEANS TO DEFINE THE PERIPHERY OF SAID ARTICLE, SAID PERIPHERY DEFINING MEANS HAVING A PLURALITY OF UNDERCUT PORTIONS INTO WHICH THE MATERIAL TO BE MOLDED DEPOSITS AS DISCRETE PROJECTIONS.
Claim 4
Dependent Claim
57 words
IN A MOLD FOR USE IN PULP MOLDING COMPRISING A PERMEABLE MOLDING SURFACE AND A HOLLOW INTERIOR ADJACENT SAID MOLDING SURFACE TO TRANSMIT FLUID PRESSURE, THE IMPROVEMENT COMPRISING MEANS TO DEFINE THE PERIPHERY OF SAID ARTICLE, SAID PERIPHERY DEFINING MEANS HAVING A PLURALITY OF UNDERCUT PORTIONS INTO WHICH THE MATERIAL TO BE MOLDED DEPOSITS AS DISCRETE PROJECTIONS.
References Cited (Backward Citations)
CA571117A
Cited
US3123519A
Cited
US2384958A
Cited
US2515113A
Cited
US2780401A
Cited
US2841054A
Cited
US3001582A
Cited
US2903063A
Cited
US3075872A
Cited
US3033434A
Cited
US3216890A
Cited
US3250668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |