Patent US3239880A successfully refreshed from Google Patents.
US3239880A
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Apparatus for determining the expansive pressure of molded polystyrene beads
Assignee: Dyfoam Corp
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Filing: 1964-07-20
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Granted: 1966-03-15
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Expires: 1984-07-20
Abstract
No abstract record available.
Inventors
- 👤 Berton R Oxel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:48
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/26; B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B29C33/00; B29C33/20; B29C44/3415; B29C44/3426; B29K; B29K2025/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
AN APPARATUS FOR DETERMINING THE EXPANSIVE PRESSURE OF POLYSTYRENE HEADS COMPRISING, A CASING FOR CONTAINING HEADS TO BE TESTED, A COVER FITTED STATIONARILY OVER THE TOP OF THE CASING, SAID COVER INCLUDING A PERFORATED LOWER PLATE AND AN IMPERFORATE UPPER PLATE, THE PLATES DEFINING A STEAM CHAMBER BETWEEN THEM, A MOVABLE PLATEN WITHIN THE CASING, SAID PLATEN BEING OF A SHAPE TO CLOSELY CONFORM TO THE INTERIOR OF THE CASING, SAID PLATES INCLUDING A STEAM CHAMBER AND PASSAGES PERMITTING THE ENTRY OF STEAM FROM THE LATTER CHAMBER INTO THE INTERIOR OF THE CASING, PRESSURE MEANS OPERATIVE TO HOLD THE PLATEN IN A PREDETERMINED POSITION, AND RECORDING MEANS CONNECTED TO THE PLATEN FOR RECORDING MOVEMENTS OF THE PLATEN FROM A PREDETERMINED POSITION UNDER EXPANSIVE PRESSURE OF THE BEAD CONTENTS OF THE CASING.
Claim 2
Independent Claim
131 words
AN APPARATUS FOR DETERMINING THE EXPANSIVE PRESSURE OF POLYSTYRENE HEADS COMPRISING, A CASING FOR CONTAINING HEADS TO BE TESTED, A COVER FITTED STATIONARILY OVER THE TOP OF THE CASING, SAID COVER INCLUDING A PERFORATED LOWER PLATE AND AN IMPERFORATE UPPER PLATE, THE PLATES DEFINING A STEAM CHAMBER BETWEEN THEM, A MOVABLE PLATEN WITHIN THE CASING, SAID PLATEN BEING OF A SHAPE TO CLOSELY CONFORM TO THE INTERIOR OF THE CASING, SAID PLATES INCLUDING A STEAM CHAMBER AND PASSAGES PERMITTING THE ENTRY OF STEAM FROM THE LATTER CHAMBER INTO THE INTERIOR OF THE CASING, PRESSURE MEANS OPERATIVE TO HOLD THE PLATEN IN A PREDETERMINED POSITION, AND RECORDING MEANS CONNECTED TO THE PLATEN FOR RECORDING MOVEMENTS OF THE PLATEN FROM A PREDETERMINED POSITION UNDER EXPANSIVE PRESSURE OF THE BEAD CONTENTS OF THE CASING.
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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |