US2618018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of fibrous cellulose derivatives to render them more easily powdered
Assignee: Acordis UK Ltd
•
Filing: 1949-09-09
•
Granted: 1952-11-18
•
Expires: 1969-09-09
Abstract
No abstract record available.
Inventors
- 👤 Downing John
- 👤 Drewitt James Gordon Napier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:07
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
PROCESS FOR THE TREATMENT OF FIBROUS CELLULOSE DERIVATIVES TO RENDER THEM MORE EASILY POWDERED, WHICH COMPRISES RAISING THE TEMPERATURE OF THE FIBROUS MATERIAL TO A DEGREE AT WHICH IT SINTERS WHILE REMAINING UNCHARRED, AT LEAST THE GREATER PART OF THE NECESSARY HEAT BEING IMPARTED TO THE FIBROUS MATERIAL BY MEANS OF MECHANICAL PRESSURE COMBINED WITH SHEARING ACTION.
Claim 2
Dependent Claim
57 words
PROCESS FOR THE TREATMENT OF FIBROUS CELLULOSE DERIVATIVES TO RENDER THEM MORE EASILY POWDERED, WHICH COMPRISES RAISING THE TEMPERATURE OF THE FIBROUS MATERIAL TO A DEGREE AT WHICH IT SINTERS WHILE REMAINING UNCHARRED, AT LEAST THE GREATER PART OF THE NECESSARY HEAT BEING IMPARTED TO THE FIBROUS MATERIAL BY MEANS OF MECHANICAL PRESSURE COMBINED WITH SHEARING ACTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |