Patent US3301927A successfully refreshed from Google Patents.
US3301927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of molding a high strength, low density structure
Assignee: General Dynamics Corp
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Filing: 1964-08-07
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Granted: 1967-01-31
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Expires: 1984-08-07
Abstract
No abstract record available.
Inventors
- 👤 George A Exley
- 👤 Louis F Scherer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:07
CPC Classifications
B; B64; B64C; B64C9/00; B64C9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
THE METHOD OF PRODUCING A HIGH STRENGTH, LOW DENSITY STRUCTURE HAVING AN IMPERFORATE OUTER SKIN, A SUPPORTING CORE MEMBER AND AN INTERMEDIATE PORTION OF LOW DENSITY COMPRISING THE STEPS OF ADHERING A QUANTITY OF BEADS OF EXPANDABLE LOW-DENSITY MATERIAL SUFFICIENT ON EXPANSION TO CONSTITUTE THE INTERMEDIATE PORTION TO A SURFACE AREA OF A SHEET OF MATERIAL WHICH WILL ULTIMATELY BE THE OUTER SKIN OF THE STRUCTURE BEING FORMED: POSITIONING A MEMBER HAVING APERTURES TRANSVERSELY WITH RESPECT TO AT LEAST A PORTION OF THE SURFACE AREA OF THE SHEET OF MATERIAL WHICH FUNCTIONS AS AN INTERNAL STRUCTURAL SUPPORT, A HEATING CONDUIT FOR THE BEDS OF EXPANDABLE MATERIAL, AND AS A SUPPORT MEMBER FOR THE FINAL PRODUCT; SECURING THE ASSEMBLY IN A MOLD; AND SUPPLYING STEAM TO THE MEMBER FOR EXPANDING THE LOW DINSITY MATERIAL SO AS TO CONFORM THE LOW DENSITY MATERIAL AND OUTER SKIN ESSENTIALLY WITH THE CONTOUR OF THE MOLD AND TO FORM THE INTERMEDIATE PORTION.
Claim 2
Independent Claim
157 words
THE METHOD OF PRODUCING A HIGH STRENGTH, LOW DENSITY STRUCTURE HAVING AN IMPERFORATE OUTER SKIN, A SUPPORTING CORE MEMBER AND AN INTERMEDIATE PORTION OF LOW DENSITY COMPRISING THE STEPS OF ADHERING A QUANTITY OF BEADS OF EXPANDABLE LOW-DENSITY MATERIAL SUFFICIENT ON EXPANSION TO CONSTITUTE THE INTERMEDIATE PORTION TO A SURFACE AREA OF A SHEET OF MATERIAL WHICH WILL ULTIMATELY BE THE OUTER SKIN OF THE STRUCTURE BEING FORMED: POSITIONING A MEMBER HAVING APERTURES TRANSVERSELY WITH RESPECT TO AT LEAST A PORTION OF THE SURFACE AREA OF THE SHEET OF MATERIAL WHICH FUNCTIONS AS AN INTERNAL STRUCTURAL SUPPORT, A HEATING CONDUIT FOR THE BEDS OF EXPANDABLE MATERIAL, AND AS A SUPPORT MEMBER FOR THE FINAL PRODUCT; SECURING THE ASSEMBLY IN A MOLD; AND SUPPLYING STEAM TO THE MEMBER FOR EXPANDING THE LOW DINSITY MATERIAL SO AS TO CONFORM THE LOW DENSITY MATERIAL AND OUTER SKIN ESSENTIALLY WITH THE CONTOUR OF THE MOLD AND TO FORM THE INTERMEDIATE PORTION.
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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) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |