US3333404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter assembly
Assignee: Union Carbide Corp
•
Filing: 1966-09-06
•
Granted: 1967-08-01
•
Expires: 1986-09-06
Abstract
No abstract record available.
Inventors
- 👤 Godfrey H Klun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:41
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/28; B; B01; B01D; B01D46/00; B01D46/10; B60; B60S; B60S1/00; B60S1/02; B60S1/46; B60S1/48; B60S1/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
AN AIR FILTER COMPRISING TWO SHEETS OF GAS PERMEABLE, HEAT SEALABLE FIBROUS MATERIAL AND A STIFF HOLLOW PERIPHERAL FRAME DISPOSED ADJACENT THE OUTER MARGINAL EDGE PORTION OF SAID AIR FILTER AND ENCLOSED AND ENVELOPED BY SAID SHEETS, HEAT SEALS JOINING SAID TWO SHEETS TOGETHER AND EXTENDING UNINTERRUPTEDLY ALONG THE INNER AND OUTER PERIPHERAL PORTION OF SAID FRAME HOLDING SAID FRAME IN A FIXED INTERNALLY DISPOSED POSITION, AND THE OUTWARDLY EXTENDING OUTER HEAT SEAL SERVING AS A COMPRESSIBLE PERIPHERAL SEAL FOR SAID AIR FILTER WHEN SAID AIR FILTER IS MOUNTED IN A STRUCTURE.
Claim 2
Dependent Claim
92 words
AN AIR FILTER COMPRISING TWO SHEETS OF GAS PERMEABLE, HEAT SEALABLE FIBROUS MATERIAL AND A STIFF HOLLOW PERIPHERAL FRAME DISPOSED ADJACENT THE OUTER MARGINAL EDGE PORTION OF SAID AIR FILTER AND ENCLOSED AND ENVELOPED BY SAID SHEETS, HEAT SEALS JOINING SAID TWO SHEETS TOGETHER AND EXTENDING UNINTERRUPTEDLY ALONG THE INNER AND OUTER PERIPHERAL PORTION OF SAID FRAME HOLDING SAID FRAME IN A FIXED INTERNALLY DISPOSED POSITION, AND THE OUTWARDLY EXTENDING OUTER HEAT SEAL SERVING AS A COMPRESSIBLE PERIPHERAL SEAL FOR SAID AIR FILTER WHEN SAID AIR FILTER IS MOUNTED IN A STRUCTURE.
References Cited (Backward Citations)
US2426405A
Cited
US2576864A
Cited
US2521984A
Cited
US2576310A
Cited
US2557279A
Cited
US3003581A
Cited
US3017698A
Cited
US3082587A
Cited
US2965197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |