Patent US2895479A successfully refreshed from Google Patents.
US2817596A
Expired / Lapsed
US
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Perforated paper
Assignee: Olin Corp
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Filing: 1955-03-29
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Granted: 1957-12-24
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Expires: 1975-03-29
Abstract
No abstract record available.
Inventors
- 👤 Milton O Schur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:58
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/18; B26F1/20; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24777
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
A PERFORATED TEA PAPER COMPRISING A LIGHTWEIGHT TISSUE SHEET HAVING A BASIS WEIGHT WITHIN THE RANGE FROM 10 TO 30 GRAMS PER SQUARE METER, SAID TISSUE SHEET BEING COATED WITH A HEAT-SEALING THERMIPLASTIC RESIN BY WHICH IT IS RENDERED SUBSTANTIALLY IMPERVIOUS TO WATER, AND THE PERFORATION IN SAID TEA BAG PAPER BEING REPTUTRED IN SAID TISSUE SHEET WITH A REGULAR SPACING AND WITH A DENSITY OF AT LEAST ABOUT 500 PERFORATIONS PER SQUARE INCH, THE RUPTURES FORMING SAID PERFORATION BEING SUBSTANTIALLY FREE OF FLAPS AND PROVIDING AN OPEN AREA IN SAID SHEET IN THE ORDER OF ABOUT 5 TO 7 PERCENT OF ITS TOTAL PERFORATED AREA.
References Cited (Backward Citations)
US2081219A
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US2149713A
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US2372508A
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US2359292A
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US2382400A
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US2414833A
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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) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |