Patent US3756849A successfully refreshed from Google Patents.
US3756849A
Expired / Lapsed
US
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Method of forming a backing for metal shells
Assignee: 3M Co
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Filing: 1971-04-01
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Granted: 1973-09-04
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Expires: 1991-04-01
Abstract
Abstract A TWO-PART BACKING COMPOSITION USEFUL FOR BACKING METAL SHELLS COMPRISES PART A AND PART B WHEREIN; PART A COMPRISES A PLIABLE, WORKABLE, THERMOCONDUCTIVE, PARTICULATE METAL AGGREGATE OF METAL PARTICLES HAVING AN AVERAGE SIZE OF BETWEEN 60 TO 400 MESH; FROM 0.2 TO 18 PARTS BY WEIGHT OF A HEAT ACTIVATED MONVOLATILE BINDER PER 100 PARTS BY WEIGHT OF METAL PARTICLES AND AN EFFECTIVE AMOUNT OF A CATALYST FOR THE THERMOSETTING RESIN OF PART B; AND PART B COMPRISES A THERMOSETTING RESIN. THE METAL AGGREGATE CAN BE CURED TO A RIGID POROUS STRUCTURE WHICH IS THEREAFTER FILLED WITH THE THERMOSETTING RESIN AND THE ENTIRE COMBINATION CURED TO A STRONG, STRUCTURALLY STABLE BACKING.
Inventors
- 👤 A Buchholz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:14
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/06; B22C9/061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |