US2538926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making waterproof fibrous containers
Assignee: Individual
•
Filing: 1946-03-25
•
Granted: 1951-01-23
•
Expires: 1966-03-25
Abstract
No abstract record available.
Inventors
- 👤 Sutherland Daniel Manson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:58
CPC Classifications
D; D21; D21J; D21J3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
THE PROCESS OF MAKING A WATERPROOF CONTAINER FROM A SUSPENSION OF FIBROUS PULP, WHICH CONSISTS OF ADDING TO THE PULP A SUSPENSION CONTAINING WET POWDERED GILSONITE AND WATER, THOROUGHLY MIXING SAID PULP AND SUSPENSION TO FORM A PULP-GILSONITE MIX, PRODUCING A SHEET FROM SAID MIX ON A SUITABLE FORMING MACHINE, DRYING THE SHEET AT A TEMPERATURE ABOVE THE BOILING POINT OF WATER AND BELOW THE MELTING POINT OF GILSONITE, REMOVING EXCESS MATERIAL FROM THE SHEET TO FORM CONTAINER ELEMENTS, REPULPING SAID EXCESS MATERIAL FOR RE-USE IN THE PROCESS, ASSEMBLING THE CONTAINER ELEMENTS IN THE FORM OF A CONTAINER, AND RAISING THE TEMPERATURE OF THE CONTAINER TO A VALUE ABOVE THE MELTING POINT OF GILSONITE THEREBY FUSING AND DISPERSING THE GILSONITE AMONG THE FIBRES AND FORMING A STRONG, RIGID, WATERPROOF CONTAINER.
Claim 2
Dependent Claim
130 words
THE PROCESS OF MAKING A WATERPROOF CONTAINER FROM A SUSPENSION OF FIBROUS PULP, WHICH CONSISTS OF ADDING TO THE PULP A SUSPENSION CONTAINING WET POWDERED GILSONITE AND WATER, THOROUGHLY MIXING SAID PULP AND SUSPENSION TO FORM A PULP-GILSONITE MIX, PRODUCING A SHEET FROM SAID MIX ON A SUITABLE FORMING MACHINE, DRYING THE SHEET AT A TEMPERATURE ABOVE THE BOILING POINT OF WATER AND BELOW THE MELTING POINT OF GILSONITE, REMOVING EXCESS MATERIAL FROM THE SHEET TO FORM CONTAINER ELEMENTS, REPULPING SAID EXCESS MATERIAL FOR RE-USE IN THE PROCESS, ASSEMBLING THE CONTAINER ELEMENTS IN THE FORM OF A CONTAINER, AND RAISING THE TEMPERATURE OF THE CONTAINER TO A VALUE ABOVE THE MELTING POINT OF GILSONITE THEREBY FUSING AND DISPERSING THE GILSONITE AMONG THE FIBRES AND FORMING A STRONG, RIGID, WATERPROOF CONTAINER.
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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) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |