US3076554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter coil
Assignee: MSA Safety Inc
•
Filing: 1960-08-03
•
Granted: 1963-02-05
•
Expires: 1980-08-03
Abstract
No abstract record available.
Inventors
- 👤 Robert A Bub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:39
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/22; B01D25/24; B01D25/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A FILTER COIL COMPRISING A PAIR OF SEPARATOR STRIPS DISPOSED IN SPACED FACE-TO-FACE RELATION AND FORMED INTO A COIL, A PAIR OF STRIPS OF FILTERING MATERIAL EXTENDING LENGTHWISE OF THE SEPARATOR STRIPS ON OPPOSITE SIDES OF ONE OF THEM, THE FILTERING STRIPS BEING CONNECTED TOGETHER ACROSS THE ADJACENT EDGE OF ONE SEPARATOR STRIP AT ONE END OF THE COIL, AND A CONTINUOUS SEPARABLE FASTENER EXTENDING ALONG THE EDGES OF THE FILTERING STRIPS AT THE OPPOSITE END OF THE COIL AND CONNECTING THEM TOGETHER ACROSS THE ADJACENT EDGE OF THE OTHER SEPARATOR STRIP, WHEREBY TO FORM A ZIGZAG FILTER SHEET IN RADIAL SECTION.
Claim 2
Dependent Claim
102 words
A FILTER COIL COMPRISING A PAIR OF SEPARATOR STRIPS DISPOSED IN SPACED FACE-TO-FACE RELATION AND FORMED INTO A COIL, A PAIR OF STRIPS OF FILTERING MATERIAL EXTENDING LENGTHWISE OF THE SEPARATOR STRIPS ON OPPOSITE SIDES OF ONE OF THEM, THE FILTERING STRIPS BEING CONNECTED TOGETHER ACROSS THE ADJACENT EDGE OF ONE SEPARATOR STRIP AT ONE END OF THE COIL, AND A CONTINUOUS SEPARABLE FASTENER EXTENDING ALONG THE EDGES OF THE FILTERING STRIPS AT THE OPPOSITE END OF THE COIL AND CONNECTING THEM TOGETHER ACROSS THE ADJACENT EDGE OF THE OTHER SEPARATOR STRIP, WHEREBY TO FORM A ZIGZAG FILTER SHEET IN RADIAL SECTION.
References Cited (Backward Citations)
GB235153A
Cited
US1872430A
Cited
US2255937A
Cited
US2574251A
Cited
US2599604A
Cited
US2564637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-04 | 1966-08-06 | 1967-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-04 | 1970-08-06 | 1971-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-04 | 1974-08-06 | 1975-02-05 | $7700.00 | Window Closed / Lapsed |