US3058162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making very low density cellular polystyrene products
Assignee: Armstrong World Industries Inc
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Filing: 1960-04-11
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Granted: 1962-10-16
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Expires: 1980-04-11
Abstract
No abstract record available.
Inventors
- 👤 Thaddeus J Grabowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:50
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/228; C08J9/232; B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B29C44/3415; B29C44/3426; B29K; B29K2025/00; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S425/00; Y10S425/119
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
THE METHOD OF MAKING VERY LOW DENSITY ARTICLES OF CELLULAR POLYSTYRENE WHICH COMPRISES CHARGING A PERFORATED MOLD WITH SUFFICIENT PARTIALLY BUT INCOMPLETELY EXPANDED POLYSTYRENE PARTICLES CONTAINING RESIDUAL AMOUNTS OF AN ORGANIC LIQUID EXPANDING AGENT BOILING WITHIN THE RANGE OF ABOUT 10*-80*C, TO FORM A FULLY EXPANDED PRODUCT HAVING A DENSITY IN THE RANGE OF 0.4-0.8 POUND PER CUBIC FOOT, PASSING SATURATED STREAM INTO SAID MOLD TO PURGE THE MOLD OF AIR AND TO ACHIEVE A STEAM
Claim 2
Independent Claim
76 words
THE METHOD OF MAKING VERY LOW DENSITY ARTICLES OF CELLULAR POLYSTYRENE WHICH COMPRISES CHARGING A PERFORATED MOLD WITH SUFFICIENT PARTIALLY BUT INCOMPLETELY EXPANDED POLYSTYRENE PARTICLES CONTAINING RESIDUAL AMOUNTS OF AN ORGANIC LIQUID EXPANDING AGENT BOILING WITHIN THE RANGE OF ABOUT 10*-80*C, TO FORM A FULLY EXPANDED PRODUCT HAVING A DENSITY IN THE RANGE OF 0.4-0.8 POUND PER CUBIC FOOT, PASSING SATURATED STREAM INTO SAID MOLD TO PURGE THE MOLD OF AIR AND TO ACHIEVE A STEAM
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) | 1965-10-15 | 1966-04-16 | 1966-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-15 | 1970-04-16 | 1970-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-15 | 1974-04-16 | 1974-10-16 | $7700.00 | Window Closed / Lapsed |