US3428720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for superatmospheric prefoaming of expandable synthetic resinous particles
Assignee: Dow Chemical Co
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Filing: 1966-09-28
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Granted: 1969-02-18
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Expires: 1986-09-28
Abstract
No abstract record available.
Inventors
- 👤 Keith R Denslow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:17
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/3461; Y; Y10; Y10S; Y10S264/00; Y10S264/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A METHOD FOR THE PREFOAMING OF SYNTHETIC RESINOUS PARTICLES UNDER SUPERATMOSPHERIC PRESSURE, THE STEPS OF THE METHOD COMPRISING CONTINUOUSLY INTRODUCING THE SUSPENSION OF AN UNEXPANDED EXPANDABLE PARTICULATE SYNTHETIC RESINOUS MATERIAL INTO AN ELONGATE RESTRICTING CONFIGURATION, INTRODUCING STEAM AT SUPERSTMOSPHERIC PRESSURE INTO THE ELONGATE CONFIGURATION, PASSING THE EXPANDABLE SYNTHETIC RESINOUS PARTICLES AND STEAM THROUGH THE ELONGATE CONFIGURATION UNDER SUPERATMOSPHERIC PRESSURE TO THEREBY AT LEAST PARTIALLY EXPAND THE EXPANDABLE PARTICLES, AND DISCHARGING IN A CONTINUOUS MANNER THE EXPANDABLE PARTICLES AND STEAM FROM THE ELONGATE TUBLAR CONFIGURATION.
Claim 2
Independent Claim
84 words
A METHOD FOR THE PREFOAMING OF SYNTHETIC RESINOUS PARTICLES UNDER SUPERATMOSPHERIC PRESSURE, THE STEPS OF THE METHOD COMPRISING CONTINUOUSLY INTRODUCING THE SUSPENSION OF AN UNEXPANDED EXPANDABLE PARTICULATE SYNTHETIC RESINOUS MATERIAL INTO AN ELONGATE RESTRICTING CONFIGURATION, INTRODUCING STEAM AT SUPERSTMOSPHERIC PRESSURE INTO THE ELONGATE CONFIGURATION, PASSING THE EXPANDABLE SYNTHETIC RESINOUS PARTICLES AND STEAM THROUGH THE ELONGATE CONFIGURATION UNDER SUPERATMOSPHERIC PRESSURE TO THEREBY AT LEAST PARTIALLY EXPAND THE EXPANDABLE PARTICLES, AND DISCHARGING IN A CONTINUOUS MANNER THE EXPANDABLE PARTICLES AND STEAM FROM THE ELONGATE TUBLAR CONFIGURATION.
References Cited (Backward Citations)
US1392656A
Cited
US1917467A
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US2306462A
Cited
US2819890A
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US3162704A
Cited
US3155379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |