Patent US3329544A successfully refreshed from Google Patents.
US3329544A
Expired / Lapsed
US
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Method of producing filter cores
Assignee: Cigarette Components Ltd
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Filing: 1962-05-07
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Granted: 1967-07-04
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Expires: 1982-05-07
Abstract
No abstract record available.
Inventors
- 👤 Smith Brian
- 👤 Davey Frederick Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:51
CPC Classifications
H; H01; H01R; H01R43/00; H01R43/027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A METHOD OF PRODUCING A FILTER CORE COMPRISING THE STEPS OF: HEATING AND EXTRUDING A MASS OF THERMOPLASTIC MATERIAL CONTAINING A THERMALLY LABILE BLOWING AGENT THROUGH A PLURALITY OF DIE ORIFICES TO PRODUCE A PLURALITY OF FILAMENTS HAVING SMALL BUBBLES FORMED THEREIN BY THE BLOWING AGENT; MAINTAINING SAID EXTRUDED FILAMENTS IN A SOFT CONDITION TO PERMIT SAID BUBBLES TO EXPAND IN ORDER TO FORM IRREGULAR ENLARGEMENTS OF SAID FILAMENTS ALONG THEIR LENGTHS; AND SUBSEQUENTLY WHILE SAID FILAMENTS ARE STILL IN A SOFT CONDITION, COMPACTING SAID FILAMENTS INTO ROD FORM THEREBY CAUSING SAID FILAMENTS TO FUSE TOGETHER AT POINTS CORRESPONDING TO SAID IRREGULAR ENLARGEMENTS.
Claim 2
Independent Claim
103 words
A METHOD OF PRODUCING A FILTER CORE COMPRISING THE STEPS OF: HEATING AND EXTRUDING A MASS OF THERMOPLASTIC MATERIAL CONTAINING A THERMALLY LABILE BLOWING AGENT THROUGH A PLURALITY OF DIE ORIFICES TO PRODUCE A PLURALITY OF FILAMENTS HAVING SMALL BUBBLES FORMED THEREIN BY THE BLOWING AGENT; MAINTAINING SAID EXTRUDED FILAMENTS IN A SOFT CONDITION TO PERMIT SAID BUBBLES TO EXPAND IN ORDER TO FORM IRREGULAR ENLARGEMENTS OF SAID FILAMENTS ALONG THEIR LENGTHS; AND SUBSEQUENTLY WHILE SAID FILAMENTS ARE STILL IN A SOFT CONDITION, COMPACTING SAID FILAMENTS INTO ROD FORM THEREBY CAUSING SAID FILAMENTS TO FUSE TOGETHER AT POINTS CORRESPONDING TO SAID IRREGULAR ENLARGEMENTS.
References Cited (Backward Citations)
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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) | 1970-07-03 | 1971-01-02 | 1971-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-03 | 1975-01-02 | 1975-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-03 | 1979-01-02 | 1979-07-04 | $7700.00 | Window Closed / Lapsed |