US3309440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing flexible foam polystyrene plastic sheeting
Assignee: B-TECH Corp 163 WEST MERRILL ST BIRMINGHAM MI 48011 A MI CORP
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Filing: 1963-02-08
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Granted: 1967-03-14
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Expires: 1983-02-08
Abstract
No abstract record available.
Inventors
- 👤 Kracht Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:47
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/228; C08J9/232; B; B29; B29C; B29C44/00; B29C44/34; B29C44/3461; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B29C44/3415; B29C44/3426; B29K; B29K2025/00; C08J2325/00; C08J2325/02; C08J2325/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A PROCESS OF PRODUCING FLEXIBLE RESILIENT FOAM POLYSTYRENE PLASTIC MATERIAL, COMPRISING PRE-EXPANDING GRANULES OF EXPANSIBLE STYRENE POLYMER PLASTIC MATERIAL CONTAINING AN EXPANDING AGENT BY APPLYING STEAM THERETO WITHIN A VERTICALLY-UNCONFINED PRE-EXPANSION SPACE AT AN ELEVATED TEMPERATURE SUBSTANTIALLY HIGHER THAN 212*F. INTO PARTICLES LARGER THAN SAID GRANULES AND OF MUCH LOWER DENSITY THAN SAID GRANULES YET POSSESSING FURTHER EXPANSIBILITY, APPLYING TO THE THUS PRE-EXPANDED PARTICLES A SUBSTANTIALLY DRY HEAT AT A DRYING TEMPERATURE OF 100*F. TO 300*F. WHEREBY TO REMOVE CONDENSED STEAM FROM SAID PARTICLES AND CAUSE AIR TO ENTER THEREIN WHILE ALSO PREVENTING CONDENSATION OF THE EXPANDING AGENT THEREIN,
Claim 2
Dependent Claim
99 words
A PROCESS OF PRODUCING FLEXIBLE RESILIENT FOAM POLYSTYRENE PLASTIC MATERIAL, COMPRISING PRE-EXPANDING GRANULES OF EXPANSIBLE STYRENE POLYMER PLASTIC MATERIAL CONTAINING AN EXPANDING AGENT BY APPLYING STEAM THERETO WITHIN A VERTICALLY-UNCONFINED PRE-EXPANSION SPACE AT AN ELEVATED TEMPERATURE SUBSTANTIALLY HIGHER THAN 212*F. INTO PARTICLES LARGER THAN SAID GRANULES AND OF MUCH LOWER DENSITY THAN SAID GRANULES YET POSSESSING FURTHER EXPANSIBILITY, APPLYING TO THE THUS PRE-EXPANDED PARTICLES A SUBSTANTIALLY DRY HEAT AT A DRYING TEMPERATURE OF 100*F. TO 300*F. WHEREBY TO REMOVE CONDENSED STEAM FROM SAID PARTICLES AND CAUSE AIR TO ENTER THEREIN WHILE ALSO PREVENTING CONDENSATION OF THE EXPANDING AGENT THEREIN,
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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |