US3745748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering process
Assignee: Johns Manville Corp
•
Filing: 1970-10-29
•
Granted: 1973-07-17
•
Expires: 1990-10-29
Abstract
Abstract Filtration of submicron liquid and solid particles from large volumes of gas in which the particles are carried is accomplished by passing the gas through a filter medium made up of fibers having an average diameter of up to about 10 microns at a velocity of at least 300 feet per minute and at a pressure drop not greater than 40 inches of water to remove at least 80 percent of such particles.
Inventors
- 👤 J Goldfield
- 👤 V Greco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:41
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2003; B01D39/2017; B01D39/2024; B01D46/00; B01D46/18; Y; Y10; Y10S; Y10S55/00; Y10S55/25
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
29 words
The process as claimed in claim 1 wherein said filter mat sheet, in an uncompressed state, has a density that does not exceed about 9 pounds per cubic foot.
Claim 2
Dependent Claim
13 words
The process as claimed in claim 1 wherein said fibers are bonded together.
Claim 3
Dependent Claim
12 words
The process as claimed in claim 1 wherein said fibers are unbonded.
Claim 4
Dependent Claim
22 words
The process as claimed in claim 1 wherein said fiber mat is compressed solely by the action of the gas moving therethrough.
Claim 5
Dependent Claim
40 words
The process as claimed in claim 1 wherein liquid particles filtered from the gas are coalesced on the filter mat sheet and relatively large droplets of such coalesced liquids are removed from the filter mat sheet and are thereafter collected.
Claim 6
Dependent Claim
36 words
The process as claimed in claim 1 wherein the fresh filter mat sheet which is introduced into the gas stream constitutes only a portion of the filter mat sheet which is exposed to the gas stream.
Claim 7
Dependent Claim
152 words
A process for filtering submicron as well as larger size liquid and solid particulate material from large volumes of a gas comprising: a. locating a movable, replaceable porous, gas pervious filter mat sheet comprising glass fibers having an average diameter of about 1 micron in a gas stream; b. passing the gas through a portion of the filter mat sheet at a velocity within an approximate rage of 400 to 850 feet per minute and at a pressure drop within an approximate range of 11 to 34 inches of water whereby at least 90 percent of said particulate material can be removed from said gas until said portion becomes spent; c. removing said spent portion of the filter mat sheet from the gas stream, and d. introducing a fresh portion of the filter mat sheet into the gas stream to replace the spent filter mat sheet portion without interrupting the filtering process.
Claim 8
Dependent Claim
155 words
A process for filtering submicron as well as larger size liquid and solid particulate material from large volumes of a gas comprising: a. locating a movable, replaceable porous, gas pervious filter mat sheet comprising glass fibers having an average diameter of about 3 to about 5 microns in a gas stream; b. passing the gas through a portion of the filter mat sheet at a velocity within a range of about 900 to 2,190 feet per minute and at a pressure drop within a range of about 7 to 38 inches of water whereby at least 90 percent of said particulate material can be removed from said gas until said portion becomes spent; c. removing said spent portion of the filter mat sheet from the gas stream; and d. introducing a fresh portion of the filter mat sheet into the gas stream to replace the spent filter mat sheet portion without interrupting the filtering process.
Claim 9
Dependent Claim
153 words
A process of filtering submicron as well as larger size liquid and solid particulate material from large volumes of a gas comprising: a. locating a movable, replaceable, porous, gas pervious filter mat sheet comprising glass fibers having an average diameter of about 8.5 microns in a gas stream; b. passing the gas through a portion of the filter mat sheet at a velocity within the range of about 1,000 to 2,000 feet per minute and at a pressure drop within a range of about 13 to 38 inches of water whereby at least 90 percent of said particulate material can be removed from said gas until said portion becomes spent; c. removing said spent portion of the filter mat sheet sheet from the gas stream; and d. introducing a fresh portion of the filter mat sheet into the gas stream to replace the spent filter mat sheet portion without interrupting the filtering process.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |