US2700634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of laminating a cellular core sandwich
Assignee: Northrop Grumman Corp
•
Filing: 1949-09-09
•
Granted: 1955-01-25
•
Expires: 1969-09-09
Abstract
No abstract record available.
Inventors
- 👤 Ackerlind Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:47
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36; E04C2/365
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN THE METHOD OF FABRICATING A CELLULAR CORE SANDWICH COMPRISING A CORE OF NON-CONDUCTIVE MATERIAL SUSCEPTIBLE TO CHARRING WHEN SUBJECTED TO EXCESSIVE HEATING, AND WHICH IS BONDED TO SKIN SHEETS BY A LAYER OF A THERMOSETTING ADHESIVE, WHICH ADHESIVE IS ACTIVATED BY DIELECTRIC HEAT GENERATED BY A HIGH FREQUENCY ELECTRIC FIELD, THE IMPROVEMENT OF INHIBITING CHARRING OF THE CORE DURING THE BONDING OPERATION WHICH CONSISTS IN IMPREGNATING SAID NON-CONDUCTIVE CORE WITH CONDUCTIVE MATERIAL WHEREBY EXCESSIVE HEATING THEREOF IS PRECLUDED.
Claim 2
Dependent Claim
79 words
IN THE METHOD OF FABRICATING A CELLULAR CORE SANDWICH COMPRISING A CORE OF NON-CONDUCTIVE MATERIAL SUSCEPTIBLE TO CHARRING WHEN SUBJECTED TO EXCESSIVE HEATING, AND WHICH IS BONDED TO SKIN SHEETS BY A LAYER OF A THERMOSETTING ADHESIVE, WHICH ADHESIVE IS ACTIVATED BY DIELECTRIC HEAT GENERATED BY A HIGH FREQUENCY ELECTRIC FIELD, THE IMPROVEMENT OF INHIBITING CHARRING OF THE CORE DURING THE BONDING OPERATION WHICH CONSISTS IN IMPREGNATING SAID NON-CONDUCTIVE CORE WITH CONDUCTIVE MATERIAL WHEREBY EXCESSIVE HEATING THEREOF IS PRECLUDED.
References Cited (Backward Citations)
US2512875A
Cited
US2291140A
Cited
US2056563A
Cited
GB577790A
Cited
US2304718A
Cited
US2376653A
Cited
US2434573A
Cited
GB567380A
Cited
US2393541A
Cited
US2423902A
Cited
US2439918A
Cited
US2428979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-24 | 1958-07-26 | 1959-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-24 | 1962-07-26 | 1963-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-24 | 1966-07-26 | 1967-01-25 | $7700.00 | Window Closed / Lapsed |