US4361464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid method for liberating the latent properties of mechanical pulps
Assignee: Domtar Inc
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Filing: 1979-10-05
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Granted: 1982-11-30
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Expires: 1999-10-05
Abstract
Abstract A method and apparatus for liberating the latent properties of a mechanical pulp is disclosed. The method is a laboratory technique for sample preparation for further pulp testing. "Latency" is released by recirculating pulp from a pool thereof through a centrifugal pump at a rate of at least four times per minute for the period required to release all the latent properties of the pulp sample ("Latency"). This depending on the rate of circulation may be completed in as little as one minute.
Inventors
- 👤 Alkibiadis Karnis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:01
CPC Classifications
D; D21; D21D; D21D1/00; D21D1/002
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
85 words
A method for releasing latent properties of mechanical pulp comprising providing a sample of mechanical pulp at a pumpable consistency and a temperature of 80° C., to 95° C. in a container, recirculating all of said sample from and to said container by means of a centrifugal pump, said pump recirculating all of said sample at a rate of at least five times a minute for a period no longer than three minutes so as to release all the latent properties of said mechanical pulp.
Claim 2
Independent Claim
85 words
A method for releasing latent properties of mechanical pulp comprising providing a sample of mechanical pulp at a pumpable consistency and a temperature of 80° C., to 95° C. in a container, recirculating all of said sample from and to said container by means of a centrifugal pump, said pump recirculating all of said sample at a rate of at least five times a minute for a period no longer than three minutes so as to release all the latent properties of said mechanical pulp.
Claim 3
Dependent Claim
29 words
A method as defined in claim 1 wherein said sample is recirculated at a rate of over ten times a minute for a period no greater than two minutes.
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) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |