US3215028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means and method for restricting a solid propellant
Assignee: Phillips Petroleum Co
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Filing: 1959-07-09
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Granted: 1965-11-02
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Expires: 1979-07-09
Abstract
No abstract record available.
Inventors
- 👤 Armin C Pitchford
- 👤 Hugh J Mcspadden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:41
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
THE METHOD OF SIMULTANEOUSLY INSULATING A ROCKET MOTOR CASE AND RESTRICTING THE SIDE WALL SURFACE OF AN END BURNING GRAIN OF SOLID PROPELLANT COMPRISING A MAJOR AMOUNT OF A SOLID INORGANIC OXIDIZING SALT AND A MINOR AMOUNT OF A RUBBER BINDER WHICH IS PREPARED FOR USE IN A ROCKET MOTOR HAVING A BURNING PERIOD IN EXCESS OF ONE MINUTE WHICH COMPRISES APPLYING TO THAT PORTION OF THE SURFACE OF THE GRAIN TO BE RESTRICTED A FRIST LAYER OF ABOUT 0.01 TO ABOUT 0.05 INCH IN THICKNESS OF UNCURED RUBBER HAVING A CURED 300 PERCENT MODULUS OF LESS THAN ABOUT 400 P.S.I.; APPLYING UPON SAID FIRST LAYER AT LEAST ANOTHER LAYER OF AT LEAST ABOUT 0.02 INCH THICKNESS OF UNCURED RUBBER HAVING HIGHER MODULUS CHARACTERISTICS THAN SAID FIRST LAYER; SUPPLYING SUFFICIENT EXTERNAL PRESSURE TO SAID LAYERS OF RUBBER ON SAID GRAIN TO MAINTAIN SAID LAYERS AND SAID GRAIN IN CONTIGUOUS CONTACT; AND HEATING SAID LAYERS AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO CURE SAID LAYERS WHILE MAINTAINING SAID PRESSURE.
Claim 2
Independent Claim
170 words
THE METHOD OF SIMULTANEOUSLY INSULATING A ROCKET MOTOR CASE AND RESTRICTING THE SIDE WALL SURFACE OF AN END BURNING GRAIN OF SOLID PROPELLANT COMPRISING A MAJOR AMOUNT OF A SOLID INORGANIC OXIDIZING SALT AND A MINOR AMOUNT OF A RUBBER BINDER WHICH IS PREPARED FOR USE IN A ROCKET MOTOR HAVING A BURNING PERIOD IN EXCESS OF ONE MINUTE WHICH COMPRISES APPLYING TO THAT PORTION OF THE SURFACE OF THE GRAIN TO BE RESTRICTED A FRIST LAYER OF ABOUT 0.01 TO ABOUT 0.05 INCH IN THICKNESS OF UNCURED RUBBER HAVING A CURED 300 PERCENT MODULUS OF LESS THAN ABOUT 400 P.S.I.; APPLYING UPON SAID FIRST LAYER AT LEAST ANOTHER LAYER OF AT LEAST ABOUT 0.02 INCH THICKNESS OF UNCURED RUBBER HAVING HIGHER MODULUS CHARACTERISTICS THAN SAID FIRST LAYER; SUPPLYING SUFFICIENT EXTERNAL PRESSURE TO SAID LAYERS OF RUBBER ON SAID GRAIN TO MAINTAIN SAID LAYERS AND SAID GRAIN IN CONTIGUOUS CONTACT; AND HEATING SAID LAYERS AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO CURE SAID LAYERS WHILE MAINTAINING SAID PRESSURE.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |