US3310364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sterilizing hygienic paper ware
Assignee: Papierfabriek Gennep NV
•
Filing: 1965-05-19
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Granted: 1967-03-21
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Expires: 1985-05-19
Abstract
No abstract record available.
Inventors
- 👤 Rijss Robertus Cornelis Maria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:42
CPC Classifications
A; A61; A61L; A61L2/00; A61L2/16; A61L2/20; A61L2/204
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A METHOD OF STERILIZING HYGIENIC PAPER WARE COMPRISING PREPARING MOISTURE ABSORBENT PAPER MATERIAL OF WHICH AT LEAST A PART HAS AN ENHANCED WET STRENGTH AND INCLUDES 0.5-4% BY WEIGHT BASED ON SAID PART OF A PARTIALLY CURED FORMALDEHYDE RESIN DISTRIBUTED THEREIN AND ADAPTED FOR ENHANCING SAID WET STRENGTH OF SAID PAPER MATERIAL, SAID RESIN BEING SELECTED FROM THE GROUP CONSISTING OF PHENOL FORMALDEHYDE RESINS, UREA FORMALDEHYDE RESINS AND MELAMINE FORMALDEHYDE RESINS, SAID RESIN BEING INTRODUCED INTO THE PAPER PULP DURING THE PREPARATION OF THE PAPER MATERIAL AND PARTIALLY CURED TO FORM A RESIN CONTAINING A SUBSTANTIAL QUANTITY OF -CH2OH GROUPS CAPABLE OF RELEASING FREE FORMALDEHYDE ON HEATING, AT TEMPERATURES FROM AT LEAST ABOUT 60*C., ENCLOSING SAID PAPER MATERIAL IN A BACTERIA IMPERMEABLE ENVELOPE CAPABLE OF RESISTING S STERILIZATION TEMPERATURE TO BE APPLIED THERETO, AND DRY HEATING THE MATERIAL IN SAID ENVELOPE AT A TEMPERATURE WITHIN THE RANGE OF FROM 60 TO 150*C. FOR AT LEAST 30 MINUTES AND SUFFICIENTLY LONG TO STERILIZE THE PAPER MATERIAL BY THE ACTION OF THE FORMALDEHYDE VAPOR WHICH IS THEREBY RELEASED.
Claim 2
Independent Claim
176 words
A METHOD OF STERILIZING HYGIENIC PAPER WARE COMPRISING PREPARING MOISTURE ABSORBENT PAPER MATERIAL OF WHICH AT LEAST A PART HAS AN ENHANCED WET STRENGTH AND INCLUDES 0.5-4% BY WEIGHT BASED ON SAID PART OF A PARTIALLY CURED FORMALDEHYDE RESIN DISTRIBUTED THEREIN AND ADAPTED FOR ENHANCING SAID WET STRENGTH OF SAID PAPER MATERIAL, SAID RESIN BEING SELECTED FROM THE GROUP CONSISTING OF PHENOL FORMALDEHYDE RESINS, UREA FORMALDEHYDE RESINS AND MELAMINE FORMALDEHYDE RESINS, SAID RESIN BEING INTRODUCED INTO THE PAPER PULP DURING THE PREPARATION OF THE PAPER MATERIAL AND PARTIALLY CURED TO FORM A RESIN CONTAINING A SUBSTANTIAL QUANTITY OF -CH2OH GROUPS CAPABLE OF RELEASING FREE FORMALDEHYDE ON HEATING, AT TEMPERATURES FROM AT LEAST ABOUT 60*C., ENCLOSING SAID PAPER MATERIAL IN A BACTERIA IMPERMEABLE ENVELOPE CAPABLE OF RESISTING S STERILIZATION TEMPERATURE TO BE APPLIED THERETO, AND DRY HEATING THE MATERIAL IN SAID ENVELOPE AT A TEMPERATURE WITHIN THE RANGE OF FROM 60 TO 150*C. FOR AT LEAST 30 MINUTES AND SUFFICIENTLY LONG TO STERILIZE THE PAPER MATERIAL BY THE ACTION OF THE FORMALDEHYDE VAPOR WHICH IS THEREBY RELEASED.
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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 |