USRE34204E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure regulation device for vehicle safety air bag
Assignee: Juichiro Takada
•
Filing: 1991-02-20
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Granted: 1993-03-30
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Expires: 2011-02-20
Abstract
Abstract Stitched thread seams between fabric elements of the envelope of a vehicle safety air bag induce localized distension and opening up of the envelope fabrics along the seams, thereby causing the film coatings of the envelope fabric to rupture along the seam and allow gas to escape and maintain a substantially constant overall maximum pressure, regardless of variations in ambient temperature.
Inventors
- 👤 Juichiro Takada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:03
CPC Classifications
B; B60; B60R; B60R21/00; B60R21/02; B60R21/16; B60R21/23; B60R21/239
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
In a vehicle safety air bag having an inflatable envelope of fabric coated with a polymeric film to make it gas tight and pressure-relief means associated with the envelope for enabling gas to escape from the envelope when the gas pressure exceeds a predetermined level, the improvement wherein the pressure relief means comprises first and second fabric elements of the envelope disposed in overlapping relation along their respective margins and a stitched thread seam along said overlapping margins adapted to induce opening up of the fabric elements and rupture of the films thereof along the seam to degrees that vary in accordance with the level of gas pressure in the envelope above said predetermined level and to allow gas to escape along the opened up seam.
Claim 2
Dependent Claim
126 words
In a vehicle safety air bag having an inflatable envelope of fabric coated with a polymeric film to make it gas tight and pressure-relief means associated with the envelope for enabling gas to escape from the envelope when the gas pressure exceeds a predetermined level, the improvement wherein the pressure relief means comprises first and second fabric elements of the envelope disposed in overlapping relation along their respective margins and a stitched thread seam along said overlapping margins adapted to induce opening up of the fabric elements and rupture of the films thereof along the seam to degrees that vary in accordance with the level of gas pressure in the envelope above said predetermined level and to allow gas to escape along the opened up seam.
Claim 3
Dependent Claim
30 words
The improvement claimed in claim 1 wherein said one element of the envelope is a main body having a hole and the second element is a patch covering the hole.
Claim 4
Dependent Claim
44 words
The improvement claimed in claim 1 wherein the first element is a major part of the envelope that includes its perimeter and the second element is a minor part within the perimeter, whereby the seam is subject to shear stresses due to gas pressure.
Claim 5
Dependent Claim
73 words
The improvement claimed in claim 1 wherein the first and second elements are also adhesively joined along said margins. .Iadd.5. In a vehicle safety air bag having an envelope of fabric coated with a polymeric film to make it gas tight and inflatable by pressurized gas from an inflator, the improvement wherein the envelope includes at least one fabric element consisting of a woven fabric and a lining film coating of silicone rubber
Claim 6
Dependent Claim
45 words
on the inner surface of the woven fabric. .Iaddend. .Iadd.6. The improvement according to claim 5 wherein all fabric elements of the envelope consist of a woven fabric and a lining film coating of silicone rubber on the inner surface of the woven fabric. .Iaddend.
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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) | 1996-03-29 | 1996-09-28 | 1997-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-29 | 2000-09-28 | 2001-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-29 | 2004-09-28 | 2005-03-30 | $7700.00 | Window Closed / Lapsed |