Patent US3131789A successfully refreshed from Google Patents.
US3131789A
Expired / Lapsed
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Non-cellular honeycomb structure
Assignee: ThyssenKrupp Budd Co
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Filing: 1961-04-26
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Granted: 1964-05-05
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Expires: 1981-04-26
Abstract
No abstract record available.
Inventors
- 👤 Watter Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:44
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; Y; Y10; Y10S; Y10S165/00; Y10S165/907; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49879; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
71 words
A NON-CELLULAR SANDWICH STRUCTURE COMPRISING, AN UPPER AND A LOWER HORIZONTAL SKIN SHEET, A PLURALITY OF LONGITUDINAL WEB STRIPS OF A COMPUND UNDULATION FORM CONNECTED TOGETHER AS REFLECTED IMAGES TO FORM A CORE SECTION, AND MEANS FOR CONNECTING SAID SKIN SHEETS TO SAID CORE SECTION AT THE EDGES OF SAID WEB STRIPS TO FORM A SANDWICH STRUCTURE HAVING CONSTANT CROSS-SECTION FREE FLOW AREAS BETWEEN SAID SKIN SHEETS AND SAID WEB STRIPS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |