Patent US3759739A successfully refreshed from Google Patents.
US3759739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Environmental protection system
Assignee: General Dynamics Corp
•
Filing: 1971-08-26
•
Granted: 1973-09-18
•
Expires: 1991-08-26
Abstract
Abstract A SYSTEM FOR PROTECTING THE EXPOSED SURFACES OF REINFORCED PLASTIC COMPOSITE STRUCTURES WHICH ARE EXPOSED TO THE WEATHER IS DISCLOSED. A SHEET OF ASBESTOS PAPER IS FLAME-SPRAYED WITH A CONDUCTIVE MATERIAL, SUCH AS ALUMINUM. THE CONDUCTIVE SURFACE IS COATED WITH A SYNTHETIC RESIN AND THEN THE COMPOSITE IS LAMINATED OVER THE STRUCTURE SURFACE. THE RESULTING SURFACE IS RESISTANT TO EROSIN BY RAIN AND DUST AND PROTECTS AGAINST LIGHTNING STRIKES AND STATIC ELECTRICITY BUILD-UP. THIS SYSTEM IS ESPECIALLY DESIRABLE FOR USE ON EXTERNAL AIRCRAFT STRUCTURE, LARGE STORAGE TANKS, ETC.
Inventors
- 👤 M Varlas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:31
CPC Classifications
B; B32; B32B; B32B13/00; B32B13/04; B32B13/12; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B32B2605/00; B32B2605/18; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31678; Y10T428/31681
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |