US3034947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-aerosol filter material
Assignee: Individual
•
Filing: 1956-04-25
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Granted: 1962-05-15
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Expires: 1976-04-25
Abstract
No abstract record available.
Inventors
- 👤 John R Conlisk
- 👤 Leonard A Jonas
- 👤 Alfred A Stamm
- 👤 Richard C Weatherwax
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:22
CPC Classifications
B; B01; B01D; B01D39/00; D; D21; D21J; D21J1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A PROCESS OF PREPARING A CARBON-CONTAINING DIFFUSION BOARD COMPRISING A PREPARING A SUSPENSION OF GROUNDWOOD PULP, HEATING SAID PULP IN WATER AT A TEMPERATURE AT LEAST AS HIGH AS ITS ATMOSPHERIC BOILING POINT, WASHING SAID PULP WITH WATER TO REMOVE WATER-SOLUBLE ACIDS AND CARBOHYDRATE DEGRADATION PRODUCTS, FORMING AN AQUEOUS SUSPENSION OF SAID PULP, ADDING TO SAID PULP FINELY DIVIDED ACTIVATED CARBON WHICH HAS BEEN IMPREGNATED WITH AN AQUEOUS SOLUTION COMPRISING CHROMIC OXIDE AND THEREAFTER DRIED, WET FORMING SAID PULP CARBON INTO A MAT, PRESSING SAID MAT, AND DRYING SAID MAT AT A MAT TEMPERATURE NOT EXCEEDING THE TEMPERATURE OF THE WATER IN SAID HEATING STEP AND IN NO CASE EXCEEDING 120*C. TO PRODUCE A SUBSTANTIALLY DRY BOARD.
Claim 2
Dependent Claim
117 words
A PROCESS OF PREPARING A CARBON-CONTAINING DIFFUSION BOARD COMPRISING A PREPARING A SUSPENSION OF GROUNDWOOD PULP, HEATING SAID PULP IN WATER AT A TEMPERATURE AT LEAST AS HIGH AS ITS ATMOSPHERIC BOILING POINT, WASHING SAID PULP WITH WATER TO REMOVE WATER-SOLUBLE ACIDS AND CARBOHYDRATE DEGRADATION PRODUCTS, FORMING AN AQUEOUS SUSPENSION OF SAID PULP, ADDING TO SAID PULP FINELY DIVIDED ACTIVATED CARBON WHICH HAS BEEN IMPREGNATED WITH AN AQUEOUS SOLUTION COMPRISING CHROMIC OXIDE AND THEREAFTER DRIED, WET FORMING SAID PULP CARBON INTO A MAT, PRESSING SAID MAT, AND DRYING SAID MAT AT A MAT TEMPERATURE NOT EXCEEDING THE TEMPERATURE OF THE WATER IN SAID HEATING STEP AND IN NO CASE EXCEEDING 120*C. TO PRODUCE A SUBSTANTIALLY DRY BOARD.
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) | 1965-05-14 | 1965-11-13 | 1966-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-14 | 1969-11-13 | 1970-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-14 | 1973-11-13 | 1974-05-15 | $7700.00 | Window Closed / Lapsed |