Patent US4371804A successfully refreshed from Google Patents.
Patent US2639251A successfully refreshed from Google Patents.
US2639251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of filter units for a filter apparatus
Assignee: Individual
•
Filing: 1950-03-21
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Granted: 1953-05-19
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Expires: 1970-03-21
Abstract
No abstract record available.
Inventors
- 👤 Aloysius C Kracklauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:03
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/39; B01D29/41
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
IN THE PRODUCTION OF A FILTER UNIT WHICH COMPRISES FILTERING SHEETS APPLIED OVER OPPOSITE FACES OF A HOLLOW FORAMINOUS DISC AND EXTENDED OUTWARDLY BEYOND THE PERIPHERY THEREOF, THE METHOD OF INTERCONNECTING AND SEALING THE SHEETS ADJACENT THEIR PERIPHERAL PORTIONS WHICH COMPRISES FIRST ASSEMBLING THE FILTER SHEETS IN PLACE UPON THE DISC, IN THEN SECURING THE SHEETS TOGETHER AT POINTS OUTWARDLY OF EACH DISC PERIPHERY, IN ASSEMBLING IN COAXIAL UNITARY RELATION A PLURALITY OF SUCH DISC WITH SECURED SHEETS APPLED THERETO FOR ROTATION ABOUT A HORIZONTAL AXIS, AND IN SLOWLY ROTATING THE ASSEMBLED DISC AND SHEETS AS A UNIT ABOVE AN ADHESIVE BATH WITH ONLY THE LOWERMOST PORTIONS OF THE FILTER SHEETS ON EACH DIPPED THEREINTO TO THEREBY UNITE THE PERIPHERAL PORTIONS OF THE SHEETS AND SIMULTANEOUSLY APPLY A SEALING COAT THEREOVER.
Claim 2
Dependent Claim
131 words
IN THE PRODUCTION OF A FILTER UNIT WHICH COMPRISES FILTERING SHEETS APPLIED OVER OPPOSITE FACES OF A HOLLOW FORAMINOUS DISC AND EXTENDED OUTWARDLY BEYOND THE PERIPHERY THEREOF, THE METHOD OF INTERCONNECTING AND SEALING THE SHEETS ADJACENT THEIR PERIPHERAL PORTIONS WHICH COMPRISES FIRST ASSEMBLING THE FILTER SHEETS IN PLACE UPON THE DISC, IN THEN SECURING THE SHEETS TOGETHER AT POINTS OUTWARDLY OF EACH DISC PERIPHERY, IN ASSEMBLING IN COAXIAL UNITARY RELATION A PLURALITY OF SUCH DISC WITH SECURED SHEETS APPLED THERETO FOR ROTATION ABOUT A HORIZONTAL AXIS, AND IN SLOWLY ROTATING THE ASSEMBLED DISC AND SHEETS AS A UNIT ABOVE AN ADHESIVE BATH WITH ONLY THE LOWERMOST PORTIONS OF THE FILTER SHEETS ON EACH DIPPED THEREINTO TO THEREBY UNITE THE PERIPHERAL PORTIONS OF THE SHEETS AND SIMULTANEOUSLY APPLY A SEALING COAT THEREOVER.
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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) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |