Patent US3001235A successfully refreshed from Google Patents.
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
•
Granted: 1961-09-26
•
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 12:20
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.
References Cited (Backward Citations)
US850003A
Cited
US915633A
Cited
US1583484A
Cited
US2561636A
Cited
US2451536A
Cited
US2461480A
Cited
US2556954A
Cited
US2593862A
Cited
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 |