US3801432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for subjecting wood chips to irradiation with electrons
Assignee: Radiation Development Co Ltd
•
Filing: 1972-02-07
•
Granted: 1974-04-02
•
Expires: 1992-02-07
Abstract
Abstract In the making of pulp from wood, wood is subjected to irradiation with electrons in an amount less than 1.0 megarad but sufficient to modify wood structure such that pumping process is facilitated by energy requirement reduction, and yield and quality of pulp maintained or improved.
Inventors
- 👤 D Free
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:29
CPC Classifications
D; D21; D21C; D21C1/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
26 words
A process in accordance with claim 1 wherein said wood chips are Western Hemlock and are subjected up to about 1.0 Megarads of electron beam irradiation.
Claim 2
Dependent Claim
24 words
A process in accordance with claim 1 wherein said wood chips are Western Hemlock and are subjected to about 0.5 Megarads electron beam irradiation.
Claim 3
Independent Claim
37 words
The method of increasing the yield of pulp from wood which comprises irradiating such wood with electron beam irradiation in amount effective to increase pulp yield therefrom and thereafter subjecting said wood to a chemical pulping process.
Claim 4
Independent Claim
36 words
The method of decreasing the refining energy in the making of mechanical pulp from wood which comprises irraDiating such wood with high energy electrons in amount sufficient to decrease the energy required to defibrate the wood.
Claim 5
Independent Claim
40 words
The method of improving the production of pulp from wood by a chemical pulping process which comprises irradiating wood with high energy electrons in amount sufficient to reduce the energy required to cook the wood and to defiberize the same.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |