Patent US3698587A successfully refreshed from Google Patents.
US3698587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self sealing composite
Assignee: Lockheed Martin Tactical Systems Inc
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Filing: 1970-06-18
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Granted: 1972-10-17
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Expires: 1990-06-18
Abstract
Abstract This invention relates to a self-sealing wall for containers and conduits comprising a substantially rigid supporting layer of liquid impervious material, a layer of foam and at least one layer of a homogeneous elastomeric polyurethane adhered to the foam.
Inventors
- 👤 Ronald E Baker
- 👤 Robert L Fogarty
- 👤 Edwin C Slagel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:44
CPC Classifications
B; B62; B62D; B62D29/00; B62D29/04; B60; B60K; B60K15/00; B60K15/03; B60K15/03177; B60K2015/03328; B60K2015/03407; Y; Y10; Y10S; Y10S220/00; Y10S220/90; Y10S220/902; Y10S428/00; Y10S428/912; Y10T; Y10T428/00; Y10T428/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
29 words
said polyurethane layer having sufficient resiliency to stretch and thereby permit passage of a projectile therethrough and then to contract to substantially seal the opening made by the projectile.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |