Patent US3850732A successfully refreshed from Google Patents.
Patent US3340138A successfully refreshed from Google Patents.
US3340138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separation of springwood and summerwood of coniferous woods
Assignee: Kimberly Clark Corp
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Filing: 1965-03-22
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Granted: 1967-09-05
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Expires: 1985-03-22
Abstract
No abstract record available.
Inventors
- 👤 Ralph V Braun
- 👤 William D Lloyd
- 👤 Byron R Terry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:05
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/02; D21B1/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN A PROCESS IN WHICH CONIFEROUS WOOD IS SUBJECTED TO MECHANICAL ACTION INCLUDING FRAGMENTIZING OF THE WOOD ALONG NATURAL LINES OF CLEVAGE DEFINING ALTERNATE LAYERS OF SPRINGWOOD AND SUMMERWOOD TO REDUCE THE WOOD TO A MIXED MASS OF INDIVIDUAL FRAGMENTS WHICH ARE RETAINED BY A 1/32 INCH SCREEN BUT PASS A 1/2 INCH SCREEN AND WHICH FRAGMENTS ARE SUBSTANTIALLY OF EITHER SPRINGWOOD OR SUMMERWOOD, THE STEP OF INTRODUCING THE MASS OF WOOD FRAGMENTS WHILE THEY ARE AT A MOISTURE CONTENT IN THE RANGE OF ABOUT 30 TO ABOUT 60% BY WEIGHT BASED ON THE TOTAL WOOD WEIGHT INTO A BODY OF AN AQUEOUS MEDIUM IN WHICH THE FRAGMENTS WHICH ARE SUBSTANTIALLY OF SPRINGWOOD FLOAT AND THE FRAGMENTS WHICH ARE SUBSTANTIALLY OF SUMMERWOOD SINK.
Claim 2
Dependent Claim
123 words
IN A PROCESS IN WHICH CONIFEROUS WOOD IS SUBJECTED TO MECHANICAL ACTION INCLUDING FRAGMENTIZING OF THE WOOD ALONG NATURAL LINES OF CLEVAGE DEFINING ALTERNATE LAYERS OF SPRINGWOOD AND SUMMERWOOD TO REDUCE THE WOOD TO A MIXED MASS OF INDIVIDUAL FRAGMENTS WHICH ARE RETAINED BY A 1/32 INCH SCREEN BUT PASS A 1/2 INCH SCREEN AND WHICH FRAGMENTS ARE SUBSTANTIALLY OF EITHER SPRINGWOOD OR SUMMERWOOD, THE STEP OF INTRODUCING THE MASS OF WOOD FRAGMENTS WHILE THEY ARE AT A MOISTURE CONTENT IN THE RANGE OF ABOUT 30 TO ABOUT 60% BY WEIGHT BASED ON THE TOTAL WOOD WEIGHT INTO A BODY OF AN AQUEOUS MEDIUM IN WHICH THE FRAGMENTS WHICH ARE SUBSTANTIALLY OF SPRINGWOOD FLOAT AND THE FRAGMENTS WHICH ARE SUBSTANTIALLY OF SUMMERWOOD SINK.
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) | 1970-09-04 | 1971-03-06 | 1971-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-04 | 1975-03-06 | 1975-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-04 | 1979-03-06 | 1979-09-05 | $7700.00 | Window Closed / Lapsed |