US3304356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing plastic fiber filters
Assignee: Kralinator Filters Ltd
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Filing: 1964-05-18
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Granted: 1967-02-14
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Expires: 1984-05-18
Abstract
No abstract record available.
Inventors
- 👤 Palmai Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:59
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/10; B01D; B01D29/00; B01D29/11; B01D29/111; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D46/00; B29; B29C; B29C69/00; B01D2239/00; B01D2239/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
IN THE METHOD OF PRODUCING FILTERS FROM A MAT OF RESILIENT FIBROUS MATERIAL BY IMPREGNATING SAID MAT WITH A THERMOSETTING RESIN THAT AT WHICH CURING OF THE RESIN COMMENCES, FORMING SAID DRIED MAT INTO A FILTER, TRANSFERRING THE FORMED FILTER INTO AN OPEN ENDED HEATED MOLD, CLOSING SAID MOLD WITH A COVER MEMBER TO COMPRESS SAID FILTER FORM AND HEATING SAID COMPRESSED FILTER FORM IN SAID MOLD TO EFFECT CURING OF THE RESIN, THE IMPROVEMENT COMPRISING THE STEPS OF APPLYING HEAT AND PRESSURE TO COMPRESS SAID FILTER FORM WITHIN SAID MOLD AFTER TRANSFER THERETO, MAINTAINING SAID PRESSURE ONLY FOR THE TIME NECESSARY TO INITIATE CURING OF THE RESIN AND THEREBY REDUCE THE RESILIENCY OF SAID FILTER FORM, RELEASING SAID PRESSURE AND CLOSING SAID MOLD WITH SAID COVER MEMBER TO RECOMPRESS SAID FILTER FORM TO THEN COMPLETE THE CURING OF SAID RESIN.
Claim 2
Dependent Claim
141 words
IN THE METHOD OF PRODUCING FILTERS FROM A MAT OF RESILIENT FIBROUS MATERIAL BY IMPREGNATING SAID MAT WITH A THERMOSETTING RESIN THAT AT WHICH CURING OF THE RESIN COMMENCES, FORMING SAID DRIED MAT INTO A FILTER, TRANSFERRING THE FORMED FILTER INTO AN OPEN ENDED HEATED MOLD, CLOSING SAID MOLD WITH A COVER MEMBER TO COMPRESS SAID FILTER FORM AND HEATING SAID COMPRESSED FILTER FORM IN SAID MOLD TO EFFECT CURING OF THE RESIN, THE IMPROVEMENT COMPRISING THE STEPS OF APPLYING HEAT AND PRESSURE TO COMPRESS SAID FILTER FORM WITHIN SAID MOLD AFTER TRANSFER THERETO, MAINTAINING SAID PRESSURE ONLY FOR THE TIME NECESSARY TO INITIATE CURING OF THE RESIN AND THEREBY REDUCE THE RESILIENCY OF SAID FILTER FORM, RELEASING SAID PRESSURE AND CLOSING SAID MOLD WITH SAID COVER MEMBER TO RECOMPRESS SAID FILTER FORM TO THEN COMPLETE THE CURING OF SAID RESIN.
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) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |