US3253967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing foam cigarette filters
Assignee: EIDP Inc
•
Filing: 1962-12-18
•
Granted: 1966-05-31
•
Expires: 1982-12-18
Abstract
No abstract record available.
Inventors
- 👤 Jr Angus Rucker Blakey
- 👤 Ii Ernest Albert Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:43
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; A; A24; A24D; A24D3/00; A24D3/06; A24D3/08; Y; Y10; Y10S; Y10S264/00; Y10S264/06; Y10S264/07; Y10S264/08; Y10S264/13; Y10S264/47; Y10S521/00; Y10S521/918; Y10S55/00; Y10S55/05; Y10S55/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS OF FORMING A PREDOMINANTLY RUPTURED POLYOXYMETHYLENE FOAM FOR USE AS A CIGARETTE FILTER COMPRISING THE STEPS OF FEEDING A POLYOXYMETHYLENE RESIN INTO AN EXTRUDER MAINTAINED AT FROM 150*C. TO 250*C., AND OPERATED AT A PRESSURE ABOVE 200 POUNDS PER SQUARE INCH, AND INJECTING A BLOWING AGENT INTO THE POLYOXYMETHYLENE RESIN MELT BEFORE IT LEAVES THE DIE WHEREBY THE POLYOXYMETHYLENE MELT IS BLOWN TO FORM A RUPTURED CELLED FOAM RIBBON HAVING A DENSITY OF FROM 0.001 TO 0.320 GRAM PER CUBIC CENTIMETER ON LEAVING THE EXTRUDER DIE, SHREDDING THE EXTRUDED FOAM TO FORM SHRED FROM 1/2 TO 3 1/2 INCHES IN LENGTH WITH A MAXIMUM DIAMTER OF ABOUT 1/8 INCH, AND WRAPPING SAID FOAM TO FORM A CIGARETTE FILTER.
Claim 2
Dependent Claim
120 words
A PROCESS OF FORMING A PREDOMINANTLY RUPTURED POLYOXYMETHYLENE FOAM FOR USE AS A CIGARETTE FILTER COMPRISING THE STEPS OF FEEDING A POLYOXYMETHYLENE RESIN INTO AN EXTRUDER MAINTAINED AT FROM 150*C. TO 250*C., AND OPERATED AT A PRESSURE ABOVE 200 POUNDS PER SQUARE INCH, AND INJECTING A BLOWING AGENT INTO THE POLYOXYMETHYLENE RESIN MELT BEFORE IT LEAVES THE DIE WHEREBY THE POLYOXYMETHYLENE MELT IS BLOWN TO FORM A RUPTURED CELLED FOAM RIBBON HAVING A DENSITY OF FROM 0.001 TO 0.320 GRAM PER CUBIC CENTIMETER ON LEAVING THE EXTRUDER DIE, SHREDDING THE EXTRUDED FOAM TO FORM SHRED FROM 1/2 TO 3 1/2 INCHES IN LENGTH WITH A MAXIMUM DIAMTER OF ABOUT 1/8 INCH, AND WRAPPING SAID FOAM TO FORM A CIGARETTE FILTER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |