Patent US2491995A successfully refreshed from Google Patents.
Patent US2986535A successfully refreshed from Google Patents.
US2986535A
Expired / Lapsed
US
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Flameproof cellular polystyrene compositions and method of preparing same
Assignee: Isoleringsaktiebolaget Wmb
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Filing: 1955-07-07
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Granted: 1961-05-30
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Expires: 1975-07-07
Abstract
No abstract record available.
Inventors
- 👤 Jacobson Ulf Carl Henrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:54
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/228; C08J9/236; C08J9/224; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06; Y; Y10; Y10S; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
THE METHOD OF PRODUCING INSULATING BODIES FROM A MASS OF PRE-EXPANDED POROUS GRANULES OF POLYSTYRENE, WHICH COMPRISES DUSTING ONTO SAID PRE-EXPANDED GRANULES A FLAME-PROOFING COMPOSITION COMPRISING CHLORINATED PARAFFIN IN THE FORM OF A POWDER EXHIBITING FREELY-RUNNING PROPERTIES AT TEMPERATURES OF AT LEAST 20* CENTIGRADE AND UP TO THOSE AT WHICH IT IS DUSTED ONTO SAID PRE-EXPANDED GRANULES, BUT BECOMING PLASTIFIED AT TEMPERATURES BETWEEN 90* AND 130* CENTIGRADE, SAID FLAME-PROOFING COMPOSITION HAVING A CHLORINE CONTENT OF 65 PERCENT TO 75 PERCENT, THEN HEATING THE THUS POWDERED, PRE-EXPANDED, GRANULES TO A TEMPERATURE BETWEEN ABOUT 90* AND ABOUT 130* CENTIGRADE TO CAUSE SAID FLAME-PROOFING COMPOSITION TO AGGLUTINIZE SAID PRE-EXPANDED GRANULES CARRYING SAID POWDER INTO A COHERENT MASS.
Claim 2
Independent Claim
114 words
THE METHOD OF PRODUCING INSULATING BODIES FROM A MASS OF PRE-EXPANDED POROUS GRANULES OF POLYSTYRENE, WHICH COMPRISES DUSTING ONTO SAID PRE-EXPANDED GRANULES A FLAME-PROOFING COMPOSITION COMPRISING CHLORINATED PARAFFIN IN THE FORM OF A POWDER EXHIBITING FREELY-RUNNING PROPERTIES AT TEMPERATURES OF AT LEAST 20* CENTIGRADE AND UP TO THOSE AT WHICH IT IS DUSTED ONTO SAID PRE-EXPANDED GRANULES, BUT BECOMING PLASTIFIED AT TEMPERATURES BETWEEN 90* AND 130* CENTIGRADE, SAID FLAME-PROOFING COMPOSITION HAVING A CHLORINE CONTENT OF 65 PERCENT TO 75 PERCENT, THEN HEATING THE THUS POWDERED, PRE-EXPANDED, GRANULES TO A TEMPERATURE BETWEEN ABOUT 90* AND ABOUT 130* CENTIGRADE TO CAUSE SAID FLAME-PROOFING COMPOSITION TO AGGLUTINIZE SAID PRE-EXPANDED GRANULES CARRYING SAID POWDER INTO A COHERENT MASS.
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) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |