US3137741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bottom casting process using coated double base propellant granules
Assignee: Individual
•
Filing: 1961-03-02
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Granted: 1964-06-16
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Expires: 1981-03-02
Abstract
No abstract record available.
Inventors
- 👤 Fletcher S Vondersmith
- 👤 Charles D Cox
- 👤 Stanley I Raider
- 👤 Malcolm A Schoner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:47
CPC Classifications
C; C06; C06B; C06B21/00; C06B21/0033; C06B21/0058; B; B29; B29C; B29C39/00; C06B21/0008; C06B21/0025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN THE PROCESS OF BOTTOM CASTING LARGE DOUBLE BASE PROPELLANT GRAINS WHEREIN CASTING SOLVENT IS ADMITTED UNDER PRESSURE INTO A MOLD BASE AND IS THEREAFTER FORCED UPWARD TO FILL THE MOLD AND DISSOLVE THE CASTING POWDER CONTAINED IN THE MOLD AND WHEREIN THE HEIGHT OF THE CASTING IS LIMITED DUE TO THE CASTING SOLVENT BECOMING EXTREMELY VISCOUS BECAUSE OF THE DISSOLUTION OF THE CASTING POWDER THEREIN AND THEREBY DIFFICULT TO FORCE BEYOND A CERTAIN HEIGHT, THE IMPROVEMENT WHICH COMPRISES PRECOATING THE GRAINS OF THE CASTING POWDER WITH A LIMITEDNITROGLYCERIN-SOLUBLE MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYVINYL ALCOHOL, SILICON RESINS, HIDE GLUE, COPOLYMERS OF METHYL VINYL ETHER AND MALEIC ANHYDRIDE, POLYVINYL PYRROLIDONE AND MALEIC POLYESTER RESINS BEFORE APPLYING THE CASTING SOLVENT.
Claim 2
Dependent Claim
121 words
IN THE PROCESS OF BOTTOM CASTING LARGE DOUBLE BASE PROPELLANT GRAINS WHEREIN CASTING SOLVENT IS ADMITTED UNDER PRESSURE INTO A MOLD BASE AND IS THEREAFTER FORCED UPWARD TO FILL THE MOLD AND DISSOLVE THE CASTING POWDER CONTAINED IN THE MOLD AND WHEREIN THE HEIGHT OF THE CASTING IS LIMITED DUE TO THE CASTING SOLVENT BECOMING EXTREMELY VISCOUS BECAUSE OF THE DISSOLUTION OF THE CASTING POWDER THEREIN AND THEREBY DIFFICULT TO FORCE BEYOND A CERTAIN HEIGHT, THE IMPROVEMENT WHICH COMPRISES PRECOATING THE GRAINS OF THE CASTING POWDER WITH A LIMITEDNITROGLYCERIN-SOLUBLE MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYVINYL ALCOHOL, SILICON RESINS, HIDE GLUE, COPOLYMERS OF METHYL VINYL ETHER AND MALEIC ANHYDRIDE, POLYVINYL PYRROLIDONE AND MALEIC POLYESTER RESINS BEFORE APPLYING THE CASTING SOLVENT.
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) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |