US2542527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing microporous material
Assignee: Exide Technologies LLC
•
Filing: 1943-10-16
•
Granted: 1951-02-20
•
Expires: 1963-10-16
Abstract
No abstract record available.
Inventors
- 👤 Honey Erie Maurice O'conor
- 👤 Hardy Charles Rupert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:18
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/26; C25; C25B; C25B13/00; C25B13/04; C25B13/08; Y; Y10; Y10S; Y10S264/00; Y10S264/61; Y10S424/00; Y10S424/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A PROCESS FOR THE PRODUCTION OF MICROPOROUS MATERIAL COMPRISING THE STEPS OF MIXING APPROXIMATELY ONE PART BY WEIGHT OF DRY, FINELY DIVIDED PARTICLES OF POLYVINYL CHLORIDE, APPROXIMATELY FIVE PARTS BY WEIGHT OF DRY, FINELY DIVIDED STARCH, AND APPROXIMATELY TWO PARTS BY WEIGHT OF A SOLVENT OF THE GROUP CONSISTING OF CYCLOHEXANONE, METHYL CYCLOHEXANONE AND CHLOROBENZENE, AND THEREBY FORMING A DOUGH IN WHICH SAID SOLVENT ACTS AS A TEMPORARY PLASTICIZER FOR THE COATING OF THE STARCH PARTICLES, EXTRUDING THE DOUGH AS A SHEET, REMOVING THE PLASTICIZER BY EVAPORATION, PASSING THE EXTRUDED SHEET THROUGH WATER AT APPROXIMATELY BOILING TEMPERATURE TO SWELL THE STARCH PARTICLES THEREBY TO INCREASE THE DIMENSIONS OF THE SHEET, PASSING THE SWOLLEN SHEET THROUGH HOT ACID TO DIGEST THE STARCH AND TO SHRINK THE SHEET TO APPROXIMATELY ITS ORIGINAL DIMENSIONS, AND THEN WASHING AND DRYING THE SHEET.
Claim 2
Dependent Claim
138 words
A PROCESS FOR THE PRODUCTION OF MICROPOROUS MATERIAL COMPRISING THE STEPS OF MIXING APPROXIMATELY ONE PART BY WEIGHT OF DRY, FINELY DIVIDED PARTICLES OF POLYVINYL CHLORIDE, APPROXIMATELY FIVE PARTS BY WEIGHT OF DRY, FINELY DIVIDED STARCH, AND APPROXIMATELY TWO PARTS BY WEIGHT OF A SOLVENT OF THE GROUP CONSISTING OF CYCLOHEXANONE, METHYL CYCLOHEXANONE AND CHLOROBENZENE, AND THEREBY FORMING A DOUGH IN WHICH SAID SOLVENT ACTS AS A TEMPORARY PLASTICIZER FOR THE COATING OF THE STARCH PARTICLES, EXTRUDING THE DOUGH AS A SHEET, REMOVING THE PLASTICIZER BY EVAPORATION, PASSING THE EXTRUDED SHEET THROUGH WATER AT APPROXIMATELY BOILING TEMPERATURE TO SWELL THE STARCH PARTICLES THEREBY TO INCREASE THE DIMENSIONS OF THE SHEET, PASSING THE SWOLLEN SHEET THROUGH HOT ACID TO DIGEST THE STARCH AND TO SHRINK THE SHEET TO APPROXIMATELY ITS ORIGINAL DIMENSIONS, AND THEN WASHING AND DRYING THE SHEET.
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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) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |