US2546618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for impregnating fiber sheets
Assignee: NOBEL FRANEAISE SOC
•
Filing: 1948-04-29
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Granted: 1951-03-27
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Expires: 1968-04-29
Abstract
No abstract record available.
Inventors
- 👤 Talet Pierre Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:02
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/70; C; C08; C08L; C08L97/00; C08L97/02; D21H25/00; D21H25/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31942; Y10T428/31949; Y10T428/31964
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A PROCESS FOR MANUFACTURING A RIGID SHEET OF MATERIAL WHICH COMPRISES DEEPLY IMPREGNATING A SHEET OF SUPPORTING MATERIAL OF FIBROUS STRUCTURE WITH AQUEOUS SOLUTION OF POLYVINYL ALCOHOL, DRYING SAID SHEET, AND IMMERSING SAID SHEET IN A MIXTURE OF 350 PARTS OF 40% FORMOL AND 150 PARTS OF 65* BAUME SULFURIC ACID TO CONVERT THE ALCOHOL SUBSTANTIALLY COMPLETELY INTO THE ACETAL.
Claim 2
Dependent Claim
60 words
A PROCESS FOR MANUFACTURING A RIGID SHEET OF MATERIAL WHICH COMPRISES DEEPLY IMPREGNATING A SHEET OF SUPPORTING MATERIAL OF FIBROUS STRUCTURE WITH AQUEOUS SOLUTION OF POLYVINYL ALCOHOL, DRYING SAID SHEET, AND IMMERSING SAID SHEET IN A MIXTURE OF 350 PARTS OF 40% FORMOL AND 150 PARTS OF 65* BAUME SULFURIC ACID TO CONVERT THE ALCOHOL SUBSTANTIALLY COMPLETELY INTO THE ACETAL.
References Cited (Backward Citations)
US2162678A
Cited
US2452152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-26 | 1954-09-25 | 1955-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-26 | 1958-09-25 | 1959-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-26 | 1962-09-25 | 1963-03-27 | $7700.00 | Window Closed / Lapsed |