US3310459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a latex impregnated cellulosic water-laid web for use as a surgical drape
Assignee: WR Grace and Co
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Filing: 1964-07-20
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Granted: 1967-03-21
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Expires: 1984-07-20
Abstract
No abstract record available.
Inventors
- 👤 James L Guthrie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:03
CPC Classifications
D; D21; D21H; D21H11/00; D21H11/16; D21H11/18; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/24; D21C; D21C9/00; D21C9/001; D21C9/002; D21C9/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
THE METHOD OF MAKING A SURGICAL DRAPE WHICH COMPRISES (A) BEATING A PULP SUSPENSION OF CELLULOSIC FIBERS FOR 2 TO 30 MINUTES TO A CANADIAN STANDARD FREENESS OF 400-600 ML., (B) MERCERIZING SAID PULP SUSPENSION IN AN AQUEOUS SOLUTION OF SODIUM HYDROXIDE OF FROM 2 O 20 WEIGHT PERCENT CONCENTRATION AT A TEMPERATURE OF FROM 0 TO 50* C., TO 50*C., (C) SEPARATING THE MERCERIZED PULP FROM THE MERCERIZATING SOLUTION TO OBTAIN A SUSPENSIO CONTAINING APPROXIMATELY 10 TO 50 PERCENT BY WEIGHT OF THE PULP, (D) SWELLING THE PULP IN A LIQUID SELECTED FROM THE GROUP CONSISTING OF HOT WATER AT 60 TO 100* CENTIGRADE AND DILUTE ACID OF FRM 1 TO 40 WEIGHT PERCENT AT 0 TO 40* CENTIGRADE FOR FIVE MINUTES TO ONE HOUR TO OBTAIN A FINAL PH OF 5-7, (E) WASHING THE PULP IN COLD WATER, (F) BEATING SAID WASHED PULP FOR 2 TO 30 MINUTES TO A CANADIAN STANDARD FREENESS OF 650-800 ML., (G) FORMING THE TREATED PULP INTO A WEB, (H) AND THEN IMPREGNATING SAID WEB WITH A LATEX MATERIAL.
Claim 2
Independent Claim
176 words
THE METHOD OF MAKING A SURGICAL DRAPE WHICH COMPRISES (A) BEATING A PULP SUSPENSION OF CELLULOSIC FIBERS FOR 2 TO 30 MINUTES TO A CANADIAN STANDARD FREENESS OF 400-600 ML., (B) MERCERIZING SAID PULP SUSPENSION IN AN AQUEOUS SOLUTION OF SODIUM HYDROXIDE OF FROM 2 O 20 WEIGHT PERCENT CONCENTRATION AT A TEMPERATURE OF FROM 0 TO 50* C., TO 50*C., (C) SEPARATING THE MERCERIZED PULP FROM THE MERCERIZATING SOLUTION TO OBTAIN A SUSPENSIO CONTAINING APPROXIMATELY 10 TO 50 PERCENT BY WEIGHT OF THE PULP, (D) SWELLING THE PULP IN A LIQUID SELECTED FROM THE GROUP CONSISTING OF HOT WATER AT 60 TO 100* CENTIGRADE AND DILUTE ACID OF FRM 1 TO 40 WEIGHT PERCENT AT 0 TO 40* CENTIGRADE FOR FIVE MINUTES TO ONE HOUR TO OBTAIN A FINAL PH OF 5-7, (E) WASHING THE PULP IN COLD WATER, (F) BEATING SAID WASHED PULP FOR 2 TO 30 MINUTES TO A CANADIAN STANDARD FREENESS OF 650-800 ML., (G) FORMING THE TREATED PULP INTO A WEB, (H) AND THEN IMPREGNATING SAID WEB WITH A LATEX MATERIAL.
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) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |