Patent US3397168A successfully refreshed from Google Patents.
US3397168A
Expired / Lapsed
US
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Thermoplastic exhibiting high viscosity at their decomposition temperatures
Assignee: Lockheed Martin Corp
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Filing: 1962-12-17
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Granted: 1968-08-13
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Expires: 1982-12-17
Abstract
No abstract record available.
Inventors
- 👤 Irvin R Kramer
- 👤 Eric L Starauss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:05
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B64; B64G; B64G1/00; B64G1/22; B64G1/52; B64G1/58; C04B41/45; C04B41/46; C04B41/48; C04B41/4857; C04B41/4861; C04B41/80; C04B41/81; C04B41/82; C04B41/83; F; F02; F02K; F02K9/00; F02K9/97; F02K9/974; C04B2111/00; C04B2111/20; C04B2111/28; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249956; Y10T428/31504; Y10T428/31511; Y10T428/31652; Y10T428/31663; Y10T428/31855; Y10T428/31938
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A COMPOSITE ABLATING HEAT SHIELD COMPRISING A POROUS CERAMIC MATERIAL HAVING A POROSITY OF AT LEAST 67% BY VOLUME HAVING THE WALLS OF THE PORES COATED WITH A THERMOSET RESIN AND HAVING ITS PORES IMPREGNATED WITH A THERMOPLSTIC RESIN STABILIZED WITH ABOUT 5 TO 20% BY WEIGHT BASED UPON THE THERMOPLASTIC RESIN OF FINELY DIVIDED COLLOIDAL SILICA.
Claim 2
Dependent Claim
57 words
A COMPOSITE ABLATING HEAT SHIELD COMPRISING A POROUS CERAMIC MATERIAL HAVING A POROSITY OF AT LEAST 67% BY VOLUME HAVING THE WALLS OF THE PORES COATED WITH A THERMOSET RESIN AND HAVING ITS PORES IMPREGNATED WITH A THERMOPLSTIC RESIN STABILIZED WITH ABOUT 5 TO 20% BY WEIGHT BASED UPON THE THERMOPLASTIC RESIN OF FINELY DIVIDED COLLOIDAL SILICA.
References Cited (Backward Citations)
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Cited
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US2971615A
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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) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |