Patent US3220910A successfully refreshed from Google Patents.
US3220910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable mandrel for forming resin reinforced wound articles
Assignee: Lockheed Martin Corp
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Filing: 1962-03-26
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Granted: 1965-11-30
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Expires: 1982-03-26
Abstract
No abstract record available.
Inventors
- 👤 George J Walkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:08
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/80; B29C53/82; B29C53/821; B29C53/824; B29C53/56; B29C53/58; B29C53/60; B29C53/602; B29C53/822; Y; Y10; Y10S; Y10S425/00; Y10S425/012
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PLASTER MANDREL FOR A GLASS FILAMENT WOUND ROCKET MOTOR CASE COMPRISING: A HOLLOW, CYLINDRICAL BODY SECTION; GENERALLY HEMISPHEROIDAL, HOLLOW END SECTIONS ATTACHED TO THE BODY SECTION; ONE OF SAID END SECTIONS HAVING A CENTRAL OPENING AND THE OTHER BEING CLOSED; LONGITUDINAL GROOVES IN THE SURFACE OF SAID BODY SECTION AT CIRCUM FERENTIAL INTERVALS LESS THAN THE DIAMETER OF THE CENTRAL OPENING; SAID GROOVES EXTENDING INTO THE END SECTIONS AND PASSING THROUGH THE APEX OF THE CLOSED END SECTION; PAPER-ENCLOSED ROUND RAWS EMBEDDED IN SAID GROOVES AND ADAPTED TO BE MANIPULATED INTO SEGMENTS; AND A FAIRING OVER THE GROOVES TO PROVIDE A SMOOTH MANDREL EXTERIOR.
Claim 2
Dependent Claim
105 words
A PLASTER MANDREL FOR A GLASS FILAMENT WOUND ROCKET MOTOR CASE COMPRISING: A HOLLOW, CYLINDRICAL BODY SECTION; GENERALLY HEMISPHEROIDAL, HOLLOW END SECTIONS ATTACHED TO THE BODY SECTION; ONE OF SAID END SECTIONS HAVING A CENTRAL OPENING AND THE OTHER BEING CLOSED; LONGITUDINAL GROOVES IN THE SURFACE OF SAID BODY SECTION AT CIRCUM FERENTIAL INTERVALS LESS THAN THE DIAMETER OF THE CENTRAL OPENING; SAID GROOVES EXTENDING INTO THE END SECTIONS AND PASSING THROUGH THE APEX OF THE CLOSED END SECTION; PAPER-ENCLOSED ROUND RAWS EMBEDDED IN SAID GROOVES AND ADAPTED TO BE MANIPULATED INTO SEGMENTS; AND A FAIRING OVER THE GROOVES TO PROVIDE A SMOOTH MANDREL EXTERIOR.
References Cited (Backward Citations)
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US2550836A
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US2744043A
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US2677165A
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US2657447A
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US3020615A
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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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |