Patent US3678624A successfully refreshed from Google Patents.
US3678624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door with double-inflatable seal and pressure chamber
Assignee: W J WOOLLEY CO
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Filing: 1970-10-12
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Granted: 1972-07-25
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Expires: 1990-10-12
Abstract
Abstract A door seal structure for use with a door frame having a door movably attached thereto. The seal structure includes a pair of spaced inflatable seals mounted on the periphery of the door and positioned for sealing contact with the door frame when expanded under the influence of a suitable pressure fluid. There is a space between the inflatable seals and means for pressurizing the space to provide a pressure barrier between the seals.
Inventors
- 👤 Vincent A Bicicchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:17
CPC Classifications
E; E06; E06B; E06B7/00; E06B7/16; E06B7/22; E06B7/23; E06B7/2318
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
An air lock having a housing defining a chamber, a floor in said chamber, a pair of door frames in said housing, a door pivotally mounted in each frame, a pair of spaced seating surfaces on each door frame, said seating surfaces being spaced concentrically with each other, with one being inside of the other, a seal structure for seating each door within its associated frame and including a pair of spaced peripherally extending inflatable seal elements mounted on the periphery of said door for sealing contact with the spaced seating surfaces on its associated door frame, the space between each pair of seal elements defining a peripherally extending pressure chamber, and means for pressurizing each of said chambers, at the bottom of each door, adjacent the floor, said seal elements lie in a horizontal plane parallel to the floor, the seal elements over the remaining periphery of the door being arranged with one seal element positioned concentrically with and outside of the other.
Claim 2
Dependent Claim
164 words
An air lock having a housing defining a chamber, a floor in said chamber, a pair of door frames in said housing, a door pivotally mounted in each frame, a pair of spaced seating surfaces on each door frame, said seating surfaces being spaced concentrically with each other, with one being inside of the other, a seal structure for seating each door within its associated frame and including a pair of spaced peripherally extending inflatable seal elements mounted on the periphery of said door for sealing contact with the spaced seating surfaces on its associated door frame, the space between each pair of seal elements defining a peripherally extending pressure chamber, and means for pressurizing each of said chambers, at the bottom of each door, adjacent the floor, said seal elements lie in a horizontal plane parallel to the floor, the seal elements over the remaining periphery of the door being arranged with one seal element positioned concentrically with and outside of the other.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |