US3001235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of a formaldehyde polymer in a crape-chip form
Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1959-02-04
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Granted: 1961-09-26
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Expires: 1979-02-04
Abstract
No abstract record available.
Inventors
- 👤 Komiyama Daisuke
- 👤 Takaki Takumi
- 👤 Ando Tatsuo
- 👤 Nii Toru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:24
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/08; C08L; C08L59/00; C08L59/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A METHOD OF MANUFACTURING A FORMALDEHYDE POLYMER IN A CRAPE-CHIP FORM WHICH COMPRISES CASTING A HOT AQUEOUS SOLUTION OF FORMALDEHYDE POLYMER HAVING A CONCENTRATION OF 60 TO 95% CALCULATED AS FORMALDEHYDE OVER A SMOOTH SURFACE OF A BODY MAINTAINED AT TEMPERATURES BELOW NON-FLUIDITY TEMPERATURE T1=83.5+3.35F, WHEREIN T1 IS AN ABSOLUTE TEMPERATURE AND F IS A PERCENT BY WEIGHT CONCENTRATION OF FORMALDEHYDE POLYMER CALCULATED AS FORMALDEHYDE, SUCH THAT THE SOLUTION IS FORMED INTO A UNIFORM THIN LAYER, SCRAPING SAID THIN LAYER OF THE SOLIDIFIED MATERIAL BEFORE THE SURFACE PORTION THEREOF IS PERFECTLY SOLIDIFIED, THUS SHAPING THE MATERIAL INTO A CRAPECHIP FORM, PROVIDING A BED TO CARRY THE MATERIAL AND PASSING A DRY INERT GAS PENETRATINGLY THROUGH THE BED TO DRY THE MATERIAL.
Claim 2
Independent Claim
121 words
A METHOD OF MANUFACTURING A FORMALDEHYDE POLYMER IN A CRAPE-CHIP FORM WHICH COMPRISES CASTING A HOT AQUEOUS SOLUTION OF FORMALDEHYDE POLYMER HAVING A CONCENTRATION OF 60 TO 95% CALCULATED AS FORMALDEHYDE OVER A SMOOTH SURFACE OF A BODY MAINTAINED AT TEMPERATURES BELOW NON-FLUIDITY TEMPERATURE T1=83.5+3.35F, WHEREIN T1 IS AN ABSOLUTE TEMPERATURE AND F IS A PERCENT BY WEIGHT CONCENTRATION OF FORMALDEHYDE POLYMER CALCULATED AS FORMALDEHYDE, SUCH THAT THE SOLUTION IS FORMED INTO A UNIFORM THIN LAYER, SCRAPING SAID THIN LAYER OF THE SOLIDIFIED MATERIAL BEFORE THE SURFACE PORTION THEREOF IS PERFECTLY SOLIDIFIED, THUS SHAPING THE MATERIAL INTO A CRAPECHIP FORM, PROVIDING A BED TO CARRY THE MATERIAL AND PASSING A DRY INERT GAS PENETRATINGLY THROUGH THE BED TO DRY THE MATERIAL.
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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) | 1964-09-25 | 1965-03-27 | 1965-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-25 | 1969-03-27 | 1969-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-25 | 1973-03-27 | 1973-09-26 | $7700.00 | Window Closed / Lapsed |