US2977274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digestion of pulp
Assignee: Alton Box Board Co
•
Filing: 1957-07-24
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Granted: 1961-03-28
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Expires: 1977-07-24
Abstract
No abstract record available.
Inventors
- 👤 Robert F Hollis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:32
CPC Classifications
D; D21; D21C; D21C5/00; D21C5/02; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
IN THE ART OF MAKING PAPER FROM WASTE PAPERS WHICH CONTAIN THERMOPLASTIC CONTAMINANTS, THE PROCESS WHICH COMPRISES THE STEPS OF CONTINUOUSLY DILUTING AND HEATING STOCK BY FEEDING IT INTO A VESSEL CONTAINING LIQUID MAINTAINED UNDER PRESSURE AND AT TEMPERATURES ABOVE 100*C., THEREBY QUICKLY TO ELEVATE THE TEMPERATURE AND DILUTE THE INCOMING STOCK, WITHDRAWING SAID STOCK FROM SAID
Claim 2
Dependent Claim
57 words
IN THE ART OF MAKING PAPER FROM WASTE PAPERS WHICH CONTAIN THERMOPLASTIC CONTAMINANTS, THE PROCESS WHICH COMPRISES THE STEPS OF CONTINUOUSLY DILUTING AND HEATING STOCK BY FEEDING IT INTO A VESSEL CONTAINING LIQUID MAINTAINED UNDER PRESSURE AND AT TEMPERATURES ABOVE 100*C., THEREBY QUICKLY TO ELEVATE THE TEMPERATURE AND DILUTE THE INCOMING STOCK, WITHDRAWING SAID STOCK FROM SAID
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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |