Patent US4452657A successfully refreshed from Google Patents.
US4452657A
Expired / Lapsed
US
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Composite integral web stiffening method
Assignee: Boeing Co
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Filing: 1982-09-15
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Granted: 1984-06-05
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Expires: 2002-09-15
Abstract
Abstract "I" beam or web structures of laminated composite material or sheets are being stiffened by transverse webs stiffeners having a tubular configuration with flattened end portions. The flattened end is inserted between the laminated web material or sheets and cured therewith to form an integral stiffened web structure.
Inventors
- 👤 Robert A. Hamm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:21
CPC Classifications
B; B29; B29D; B29D99/00; B29D99/0003; B29C; B29C70/00; B29C70/68; B29C70/86; B29C70/865; B29D24/00; B29D24/002; B29D24/008; B29C70/685; B29C70/687; B29K; B29K2063/00; B29K2707/00; B29L; B29L2031/00; B29L2031/767; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1005; Y10T156/1028; Y10T156/103; Y10T156/1033; Y10T156/1051; Y10T156/1052; Y10T156/1062; Y10T156/1075; Y10T156/1077; Y10T156/1089; Y10T428/00; Y10T428/24; Y10T428/24174; Y10T428/24182
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A method of manufacturing and stiffening graphite epoxy web structures into a load-carrying beam support structure for aeronautical vehicles having at least one hat section and a web structure comprising the steps of: a. providing a web structure consisting of two adjacent web sheets of composite material; b. forming at least one hat section; c. cutting a tube substantially as long as the portion of the web to be stiffened; d. flattening at least one end of the tube; e. inserting the flattened end of the tube between the web sheets towards and against the hat section; and f. curing the hat section with a cap strip of composite material and the two adjacent web sheets substantially equally about the inserted tube circumference so that the tube and the cured about web sheets become a stiffened structural web and together with the hat section forms a load-carrying beam.
Claim 2
Independent Claim
148 words
A method of manufacturing and stiffening graphite epoxy web structures into a load-carrying beam support structure for aeronautical vehicles having at least one hat section and a web structure comprising the steps of: a. providing a web structure consisting of two adjacent web sheets of composite material; b. forming at least one hat section; c. cutting a tube substantially as long as the portion of the web to be stiffened; d. flattening at least one end of the tube; e. inserting the flattened end of the tube between the web sheets towards and against the hat section; and f. curing the hat section with a cap strip of composite material and the two adjacent web sheets substantially equally about the inserted tube circumference so that the tube and the cured about web sheets become a stiffened structural web and together with the hat section forms a load-carrying beam.
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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) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |