USRE28102E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration mask
Assignee: —
•
Filing: 1973-06-21
•
Granted: 1974-08-06
•
Expires: 1993-06-21
Abstract
Abstract A FACE MASK HAVING HIGH AND PROLONGED FILTERING EFFICIENCY SPECIALLY ADAPTED FOR SURGICAL USED FORMED FROM A FLTERING WEB COMPOSED ENTIRELY OF SYNTHETIC ORGANIC FIBERS INCLUDING FILTERING FIBERS 0.5 TO 6 MICRONS IN DIAMETER AND A NON-FUZZY FACE CONTACTING LAYER FORMED FROM A POROUS SMOOTH-SURFACED THERMOPLASTIC FILM.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:41
CPC Classifications
A; A41; A41D; A41D13/00; A41D13/05; A41D13/11; A41D13/1107; A41D13/1115
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |