Air filter testing apparatus
Abstract
Abstract AN IMPROVEMENT IN AIR FILTER TESTING APPARATUS IN WHICH A MEASURED AMOUNT OF DUST IS DRAWN INTO A TEST FILTER AT A CONTROLLED RATE OF THE DUST-LADEN AIR INTO THE TEST FILTER IS DISCLOSED. DUST IS DRAWN BY AN ASPIRATOR THROUGH A NOZZLE FROM AN ANNULAR TROUGH ROTATED AT A PREDETERMINED SPEED AND SUPPLIED TO AIR FLOWING INTO THE TEST FILTER. AIR FROM THE TEST FILTER IS THEN DRAWN THROUGH AN ABSOLUTE FILTER. AT THE END OF THE TEST, THE WEIGHT OF DUST ON THE AIR FILTER IS COMPARED TO THE WEIGHT OF DUST ON THE ABSOLUTE FILTER AND MEASURED AGAINST THE KNOWN WEIGHT OF DUST SUPPLIED TO THE APPARATUS TO DETERMINE THE PERFORMANCE OF THE AIR FILTER. VARIABLE MANUAL AND AUTOMATIC CONTROLS PROVIDE REQUIRED PROGRAMMING AND PROTECTION OF THE SYSTEM AGAINST OVERLOAD.
Inventors
- 👤 Robert Brevko
- 👤 John R Mucka
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |