US3075337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas filter
Assignee: Baumgartner Papiers SA
•
Filing: 1960-06-17
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Granted: 1963-01-29
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Expires: 1980-06-17
Abstract
No abstract record available.
Inventors
- 👤 Erhard C Andreae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:51
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/10; F; F24; F24F; F24F13/00; F24F13/28; B01D2275/00; B01D2275/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A FILTER STRUCTURE COMPRISING AT LEAST TWO SHEETS OF MATERIAL DISPOSED OPPOSITE EACH OTHER, APERTURES DISPOSED IN SPACED PARALLEL ROWS IN ONE OF SAID SHEETS, FURTHER APERTURES DISPOSED IN SPACED PARALLEL ROWS IN A SECOND SHEET, THE DISTANCE BETWEEN EACH ROW OF FURTHER APERTURES IN SAID SECOND SHEET BEING GREATER THAN THE DISTANCE BETWEEN EACH ROW OF APERTURES IN SAID ONE SHEET, EACH SHEET HAVING PARALLEL FOLDS IN ZIG-ZAG MANNER, CERTAIN OF THE FOLDS PASSING THROUGH THE ROWS OF SAID APERTURES AND CERTAIN OTHER FOLDS PASSING EQUIDISTANTLY THEREBETWEEN, AND MEANS CONNECTING THE FOLDS PASSING THROUGH THE ROWS OF APERTURES OF ONE SHEET WITH THE FOLDS EQUIDISTANTLY BETWEEN THE FOLDS PASSING THROUGH THE ROWS OF APERTURES OF THE SECOND SHEET TO FORM AND DELIMIT A PLURALITY OF CHAMBERS THEREBETWEEN.
Claim 2
Dependent Claim
128 words
A FILTER STRUCTURE COMPRISING AT LEAST TWO SHEETS OF MATERIAL DISPOSED OPPOSITE EACH OTHER, APERTURES DISPOSED IN SPACED PARALLEL ROWS IN ONE OF SAID SHEETS, FURTHER APERTURES DISPOSED IN SPACED PARALLEL ROWS IN A SECOND SHEET, THE DISTANCE BETWEEN EACH ROW OF FURTHER APERTURES IN SAID SECOND SHEET BEING GREATER THAN THE DISTANCE BETWEEN EACH ROW OF APERTURES IN SAID ONE SHEET, EACH SHEET HAVING PARALLEL FOLDS IN ZIG-ZAG MANNER, CERTAIN OF THE FOLDS PASSING THROUGH THE ROWS OF SAID APERTURES AND CERTAIN OTHER FOLDS PASSING EQUIDISTANTLY THEREBETWEEN, AND MEANS CONNECTING THE FOLDS PASSING THROUGH THE ROWS OF APERTURES OF ONE SHEET WITH THE FOLDS EQUIDISTANTLY BETWEEN THE FOLDS PASSING THROUGH THE ROWS OF APERTURES OF THE SECOND SHEET TO FORM AND DELIMIT A PLURALITY OF CHAMBERS THEREBETWEEN.
References Cited (Backward Citations)
US913802A
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US981058A
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CH99035A
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US1588402A
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US2227385A
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GB601415A
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US2909237A
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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) | 1966-01-28 | 1966-07-30 | 1967-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-28 | 1970-07-30 | 1971-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-28 | 1974-07-30 | 1975-01-29 | $7700.00 | Window Closed / Lapsed |