US3034981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter papers
Assignee: Bernard Dumas SAS
•
Filing: 1958-07-10
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Granted: 1962-05-15
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Expires: 1978-07-10
Abstract
No abstract record available.
Inventors
- 👤 Poelman Armand Jacques Julien
- 👤 Germain Marc Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:31
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2082
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A FILTER PAPER CONSISTING OF ASBESTOS FIBERS OF DIFFERENT SIZE GROUPS, A FIRST GROUP OF ASBESTOS FIBERS HAVING A DIAMETER OF BETWEEN 5 AND 10 MICRONS AND A LENGTH OF BETWEEN ABOUT 5 AND 10 MM. AND BEING PRESENT IN AN AMOUNT OF ABOUT 20% BY WEIGHT SO AS TO GIVE SAID FILTER PAPER MECHANICAL STRENGTH, A SECOND GROUP OF ASBESTOS FIBERS HAVING A DIAMETER OF BETWEEN 0.1 AND 0.5 MICRON AND HAVING A LENGTH OF BETWEEN ABOUT 0.02 AND 0.05 MM. AND BEING PRESENT IN AN AMOUNT OF ABOUT 20% BY WEIGHT SO AS TO GIVE SAID FILTER PAPER A HIGH FILTRATION POWER AND THE REMAINDER OF SAID ASBESTOS FIBERS BEING OF LENGTHS AND DIAMETERS INTERMEDIATE THE LENGTHS AND DIAMETERS OF SAID TWO GROUPS OF ASBESTOS FIBERS.
Claim 2
Dependent Claim
128 words
A FILTER PAPER CONSISTING OF ASBESTOS FIBERS OF DIFFERENT SIZE GROUPS, A FIRST GROUP OF ASBESTOS FIBERS HAVING A DIAMETER OF BETWEEN 5 AND 10 MICRONS AND A LENGTH OF BETWEEN ABOUT 5 AND 10 MM. AND BEING PRESENT IN AN AMOUNT OF ABOUT 20% BY WEIGHT SO AS TO GIVE SAID FILTER PAPER MECHANICAL STRENGTH, A SECOND GROUP OF ASBESTOS FIBERS HAVING A DIAMETER OF BETWEEN 0.1 AND 0.5 MICRON AND HAVING A LENGTH OF BETWEEN ABOUT 0.02 AND 0.05 MM. AND BEING PRESENT IN AN AMOUNT OF ABOUT 20% BY WEIGHT SO AS TO GIVE SAID FILTER PAPER A HIGH FILTRATION POWER AND THE REMAINDER OF SAID ASBESTOS FIBERS BEING OF LENGTHS AND DIAMETERS INTERMEDIATE THE LENGTHS AND DIAMETERS OF SAID TWO GROUPS OF ASBESTOS FIBERS.
References Cited (Backward Citations)
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Cited
US2407581A
Cited
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Cited
US2797163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-14 | 1965-11-13 | 1966-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-14 | 1969-11-13 | 1970-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-14 | 1973-11-13 | 1974-05-15 | $7700.00 | Window Closed / Lapsed |