US3696561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biological door seal
Assignee: United States Department of the Army
•
Filing: 1971-04-01
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Granted: 1972-10-10
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Expires: 1991-04-01
Abstract
Abstract A reliable leak-proof biological door seal for use with cabinets containing highly infectious materials therein. The door is provided with a beaded resilient membrane which is stretched over a continuous U-shaped frame section describing the near peripheral portions of each side of the inside of the door which is contacted by mating seating flange integral the cabinet proper for maintaining the cabinet absolutely tight under positive or negative pressures.
Inventors
- 👤 Richard D Harp
- 👤 Lyle G Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:26
CPC Classifications
E; E06; E06B; E06B7/00; E06B7/16; E06B7/22; E06B7/23; E06B7/2305; E06B7/2307; E06B7/231
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
25 words
The device of claim 1 wherein said membrane is beaded at its extremities for ready attachment between outer protective plate means and inner support means.
Claim 2
Dependent Claim
22 words
The device of claim 1 wherein said membrane comprises a material selected from the group consisting of pure gum rubber and neoprene.
Claim 3
Dependent Claim
25 words
The device of claim 1 wherein said door seal system is dichlorodifluoromethane-tight for positive and negative pressures up to and including 27 inches water gauge.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |