Patent US1520852A successfully refreshed from Google Patents.
US2816355A
Expired / Lapsed
US
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Method of forming a sandwich structure with a cellular core
Assignee: Rohr Inc
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Filing: 1954-05-24
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Granted: 1957-12-17
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Expires: 1974-05-24
Abstract
No abstract record available.
Inventors
- 👤 Hartley R Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:53
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/0008; B23K1/0014; Y; Y10; Y10S; Y10S165/00; Y10S165/907; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366; Y10T29/49826; Y10T29/49879; Y10T29/49904; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12069; Y10T428/12076; Y10T428/12083; Y10T428/1234; Y10T428/12493; Y10T428/12708; Y10T428/12736
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
THE METHOD OF FORMING A PLURALITY OF THIN FLAT METAL SHEETS INTO A HONEYCOMB STRUCTURE COMPRISING THE STEPS OF APPLYING TO THE TOP FACE OF EACH SHEET A PLURALITY OF PARALLEL THERMOPLASTIC RESIN STRIPS HAVING THE METAL PARTICLES DISPERSED THEREIN, THE SPACING BETWEEN THE STRIPS BEING UNIFORM AND GREATER THAN THE WIDTH OF THE STRIPS; STACKING THE SHEETS SO THAT THE STRIP ARE STAGGERED; HEATING THE STACK OF SHEETS TO A TEMPERATURE BELOW THE MELTING POINT OF SAID METAL PARTICLES BUT HIGH ENOUGH TO CAUSE THE RESIN TO SET WHILE SIMULTANEOUSLY APPLYING PRESSURE TO THE STACK TO CAUSE THE RESIN TO CONNECT THE SHEETS TOGETHER; SEPARATING THE OUTERMOST SHEETS TO DEFORM THE SHEETS INTO A MULTIPLICITY OF INTERCONNECTED CELLS; AND HEATING ALL THE CELLS SIMULTANEOUSLY MELT THE METAL OF THE PARTICLES TO BRAZE THE CELLS TOGETHER WHILE SURROUNDING THE CELLS WITH A GAS WHICH IS FREE OF OXYGEN.
Claim 2
Independent Claim
148 words
THE METHOD OF FORMING A PLURALITY OF THIN FLAT METAL SHEETS INTO A HONEYCOMB STRUCTURE COMPRISING THE STEPS OF APPLYING TO THE TOP FACE OF EACH SHEET A PLURALITY OF PARALLEL THERMOPLASTIC RESIN STRIPS HAVING THE METAL PARTICLES DISPERSED THEREIN, THE SPACING BETWEEN THE STRIPS BEING UNIFORM AND GREATER THAN THE WIDTH OF THE STRIPS; STACKING THE SHEETS SO THAT THE STRIP ARE STAGGERED; HEATING THE STACK OF SHEETS TO A TEMPERATURE BELOW THE MELTING POINT OF SAID METAL PARTICLES BUT HIGH ENOUGH TO CAUSE THE RESIN TO SET WHILE SIMULTANEOUSLY APPLYING PRESSURE TO THE STACK TO CAUSE THE RESIN TO CONNECT THE SHEETS TOGETHER; SEPARATING THE OUTERMOST SHEETS TO DEFORM THE SHEETS INTO A MULTIPLICITY OF INTERCONNECTED CELLS; AND HEATING ALL THE CELLS SIMULTANEOUSLY MELT THE METAL OF THE PARTICLES TO BRAZE THE CELLS TOGETHER WHILE SURROUNDING THE CELLS WITH A GAS WHICH IS FREE OF OXYGEN.
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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) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |