US3235633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of molding filter end caps
Assignee: Motors Liquidation Co
•
Filing: 1962-04-02
•
Granted: 1966-02-15
•
Expires: 1982-04-02
Abstract
No abstract record available.
Inventors
- 👤 Robert E Holloway
- 👤 James A Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:22
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/2403; B01D46/2411; B01D46/2414; B01D46/52; B01D46/521; B29; B29C; B29C44/00; B29C44/02; B29C44/12; F; F02; F02M; F02M35/00; F02M35/02; F02M35/024; B01D2271/00; B01D2271/02; B01D2271/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A METHOD OF MAKING A FILTER ELEMENT INCLUDING A POROUS, FIBROUS ANNULUS AND END CAPS SERVING AS A COMBINED CLOSURE AND GASKET FOR THE ANNULUS, THE STEPS COMPRISING DEPOSITING A LAYER OF A FOAMABLE POLYURETHANE RESIN CAPABLE OF FORMING A FLEXIBLE, FOAMED POLYURETHANE MASS IN THE BASE OF AN ANNULAR MOLD, IMMERSING AN END OF SAID ANNULUS IN SAID LAYER AND THEN SUBJECTING SIAD FOAMABLE RESIN TO HEAT AT A TEMPERATURE SUBSTANTIALLY BELOW THE CHARRING TEMPERATURE OF SAID ANNULUS WHEREBY THE RESIN IS CAUSED TO FOAM AND RISE SO AS TO COMPELETELY ENVELOP SAID END OF SAID ANNULUS.
Claim 2
Independent Claim
98 words
A METHOD OF MAKING A FILTER ELEMENT INCLUDING A POROUS, FIBROUS ANNULUS AND END CAPS SERVING AS A COMBINED CLOSURE AND GASKET FOR THE ANNULUS, THE STEPS COMPRISING DEPOSITING A LAYER OF A FOAMABLE POLYURETHANE RESIN CAPABLE OF FORMING A FLEXIBLE, FOAMED POLYURETHANE MASS IN THE BASE OF AN ANNULAR MOLD, IMMERSING AN END OF SAID ANNULUS IN SAID LAYER AND THEN SUBJECTING SIAD FOAMABLE RESIN TO HEAT AT A TEMPERATURE SUBSTANTIALLY BELOW THE CHARRING TEMPERATURE OF SAID ANNULUS WHEREBY THE RESIN IS CAUSED TO FOAM AND RISE SO AS TO COMPELETELY ENVELOP SAID END OF SAID ANNULUS.
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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) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |