Patent US3381077A successfully refreshed from Google Patents.
US3381077A
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US
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Method for inflating closed cell foams
Assignee: EIDP Inc
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Filing: 1966-01-26
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Granted: 1968-04-30
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Expires: 1986-01-26
Abstract
No abstract record available.
Inventors
- 👤 Jr Willard Hallam Bonner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:04
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/36; Y; Y10; Y10S; Y10S521/00; Y10S521/91; Y10S521/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
METHOD FOR INTRODUCING AN IMPERMEANT INFLATANT INTO THE CLOSED CELLS OF A LOW-DENSITY CELLULAR STRUCTURE FORMED OF A FILM-FORMING HIGH-MOLECULAR-WEIGHT POLYMER, SAID CELLULAR STRUCTURE HAVING A MAJOR PROPORTION OF CLOSED CELLS DEFINED BY GAS-PERMEABLE WALLS AND BEING CHARACTERIZED IN THAT IT IS YIELDABLE SUCH THAT SUBSTANTIAL DEFORMATION OCCURS UNDER EXTERNALLY APPLIED PRESSURES, WHICH METHOD COMPRISES THE STEPS OF (1) EXPOSING SAID CELLULAR STRUCTURE TO A NON-SOLVENT, VOLATILE, PLASTICIZING FLUID AT A TEMPERATURE EQUAL TO OR LESS THAN ITS NORMAL BOILING POINT, (2) TRANSFERRING THE STRUCTURE, WHILE STILL WET WITH AND PLASTICIZED BY THE PLASTICIZING FLUID, TO A FLUID BATH COMPRISING IMPERMEANT INFLATANT, AND (3) EXPOSING THE STRUCTURE TO AN AIR ATMOSPHERE.
Claim 2
Dependent Claim
111 words
METHOD FOR INTRODUCING AN IMPERMEANT INFLATANT INTO THE CLOSED CELLS OF A LOW-DENSITY CELLULAR STRUCTURE FORMED OF A FILM-FORMING HIGH-MOLECULAR-WEIGHT POLYMER, SAID CELLULAR STRUCTURE HAVING A MAJOR PROPORTION OF CLOSED CELLS DEFINED BY GAS-PERMEABLE WALLS AND BEING CHARACTERIZED IN THAT IT IS YIELDABLE SUCH THAT SUBSTANTIAL DEFORMATION OCCURS UNDER EXTERNALLY APPLIED PRESSURES, WHICH METHOD COMPRISES THE STEPS OF (1) EXPOSING SAID CELLULAR STRUCTURE TO A NON-SOLVENT, VOLATILE, PLASTICIZING FLUID AT A TEMPERATURE EQUAL TO OR LESS THAN ITS NORMAL BOILING POINT, (2) TRANSFERRING THE STRUCTURE, WHILE STILL WET WITH AND PLASTICIZED BY THE PLASTICIZING FLUID, TO A FLUID BATH COMPRISING IMPERMEANT INFLATANT, AND (3) EXPOSING THE STRUCTURE TO AN AIR ATMOSPHERE.
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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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |