Patent US3237913A successfully refreshed from Google Patents.
US3237913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsible mandrel for forming a cavity in solid propellant rocket fuel
Assignee: ATK Launch Systems LLC
•
Filing: 1963-06-24
•
Granted: 1966-03-01
•
Expires: 1983-06-24
Abstract
No abstract record available.
Inventors
- 👤 Homer H Sellers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:29
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/44; B29C33/48; B29C33/485; Y; Y10; Y10S; Y10S425/00; Y10S425/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A COLLAPSIBLE MANDREL FOR FORMING THE CAVITY CONFIGURATION IN A SOLID PROPELLANT FOR LARGE PROPULSION UNITS COMPRISING A PLURALITY OF DISMOUNTABLE SECTIONS, A CENTERING BODY POSITIONED AT THE CENTRAL AXIS OF SAID SECTIONS TO MAINTAIN SAID SECTIONS IN LONGITUDINAL ALIGNMENT WITHIN SAID UNITS DURING THE CASTING AND CURING OF SAID SOLID PROPELLANT, SAID COLLAPSIBLE MANDREL CONTAINING AT LEAST TWO STAR POINTS, EACH OF SAID STAR POINTS INCLUDING SIMILAR WALL SECTIONS, UPPER AND LOWER COVERS COACTING WITH THE PERIPHERAL EDGES OF SAID SECTIONS TO PROVIDE A UNITARY STRUCTURE, EACH OF SAID UPPER COVERS HAVING A PERIPHERAL CONVEXITY THEREON, EACH OF SAID LOWER COVERS HAVING A PERIPHERAL CONCAVITY THEREON THAT IS ADAPTED TO COACT WITH THE PERIPHERAL CONVEXITY ON THE UPPER COVER THAT IS POSITIONED IN MATING RELATION THERETO, SPRING-BIASED LATCH MEANS CONNECTED TO AND EXTENDING BETWEEN SAID UPPER AND LOWER COVERS OF EACH SECTION TO MAINTAIN SAID UPPER
Claim 2
Dependent Claim
147 words
A COLLAPSIBLE MANDREL FOR FORMING THE CAVITY CONFIGURATION IN A SOLID PROPELLANT FOR LARGE PROPULSION UNITS COMPRISING A PLURALITY OF DISMOUNTABLE SECTIONS, A CENTERING BODY POSITIONED AT THE CENTRAL AXIS OF SAID SECTIONS TO MAINTAIN SAID SECTIONS IN LONGITUDINAL ALIGNMENT WITHIN SAID UNITS DURING THE CASTING AND CURING OF SAID SOLID PROPELLANT, SAID COLLAPSIBLE MANDREL CONTAINING AT LEAST TWO STAR POINTS, EACH OF SAID STAR POINTS INCLUDING SIMILAR WALL SECTIONS, UPPER AND LOWER COVERS COACTING WITH THE PERIPHERAL EDGES OF SAID SECTIONS TO PROVIDE A UNITARY STRUCTURE, EACH OF SAID UPPER COVERS HAVING A PERIPHERAL CONVEXITY THEREON, EACH OF SAID LOWER COVERS HAVING A PERIPHERAL CONCAVITY THEREON THAT IS ADAPTED TO COACT WITH THE PERIPHERAL CONVEXITY ON THE UPPER COVER THAT IS POSITIONED IN MATING RELATION THERETO, SPRING-BIASED LATCH MEANS CONNECTED TO AND EXTENDING BETWEEN SAID UPPER AND LOWER COVERS OF EACH SECTION TO MAINTAIN SAID UPPER
References Cited (Backward Citations)
NL31221C
Cited
NL75011C
Cited
US626088A
Cited
US793539A
Cited
US942922A
Cited
US1260275A
Cited
DE412467C
Cited
CH117298A
Cited
US1996678A
Cited
US2170188A
Cited
US2315634A
Cited
US2564026A
Cited
US2845658A
Cited
US2818627A
Cited
FR1155826A
Cited
US2929125A
Cited
US2970343A
Cited
US2952876A
Cited
US3001363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |