US2708982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Individual
•
Filing: 1947-07-08
•
Granted: 1955-05-24
•
Expires: 1967-07-08
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Mcguff
- 👤 Roland W Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:08
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
60 words
A FILTER MEDIUM FOR SEPARATING SUSPENDED PARTICLES FROM GASES CONSISTING ESSENTIALLY OF A WATER-LAID SHEET OF INTERFELTED SUBSTANTIALLY UNHYDRATED FIBERS, AT LEAST 5% BY WEIGHT OF SAID FIBERS HAVING A DIAMETER LESS THAN A MICRON AND THE REMAINDER OF SAID FIBERS HAVING DIAMETERS GREATER THAN ONE MICRON, THE FINER FIBERS BEING SUBSTANTIALLY UNIFORMLY AND HOMOGENEOUSLY DISTRIBUTED AMONG THE COARSER FIBRES.
Claim 2
Dependent Claim
60 words
A FILTER MEDIUM FOR SEPARATING SUSPENDED PARTICLES FROM GASES CONSISTING ESSENTIALLY OF A WATER-LAID SHEET OF INTERFELTED SUBSTANTIALLY UNHYDRATED FIBERS, AT LEAST 5% BY WEIGHT OF SAID FIBERS HAVING A DIAMETER LESS THAN A MICRON AND THE REMAINDER OF SAID FIBERS HAVING DIAMETERS GREATER THAN ONE MICRON, THE FINER FIBERS BEING SUBSTANTIALLY UNIFORMLY AND HOMOGENEOUSLY DISTRIBUTED AMONG THE COARSER FIBRES.
Claim 3
Independent Claim
68 words
A METHOD FOR UNIFORMLY AND HOMOGENEOUSLY DISTRIBUTING A MASS OF FIBERS HAVING DIAMETERS LESS THAN ONE MICRON WITH FIBERS HAVING DIAMETERS IN THE ORDER OF 20 MICRONS, WHICH CONSISTS ESSENTIALLY IN THOROUGHLY DISPERSING THE FIBERS HAVING THE DIAMETERS LESS THAN ONE MICRON WITH FIBERS HAVING DIAMETERS BETWEEN 6 AND 15 MICRONS AND THEN ADMIXING SAID MIXTURE WITH THE FIBERS HAVING THE DIAMETERS IN THE ORDER OF 20 MICRONS.
Claim 4
Independent Claim
68 words
A METHOD FOR UNIFORMLY AND HOMOGENEOUSLY DISTRIBUTING A MASS OF FIBERS HAVING DIAMETERS LESS THAN ONE MICRON WITH FIBERS HAVING DIAMETERS IN THE ORDER OF 20 MICRONS, WHICH CONSISTS ESSENTIALLY IN THOROUGHLY DISPERSING THE FIBERS HAVING THE DIAMETERS LESS THAN ONE MICRON WITH FIBERS HAVING DIAMETERS BETWEEN 6 AND 15 MICRONS AND THEN ADMIXING SAID MIXTURE WITH THE FIBERS HAVING THE DIAMETERS IN THE ORDER OF 20 MICRONS.
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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) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |