Patent US2673799A successfully refreshed from Google Patents.
US2673799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing cigarette paper
Assignee: Ecusta Paper Corp
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Filing: 1952-09-25
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Granted: 1954-03-30
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Expires: 1972-09-25
Abstract
No abstract record available.
Inventors
- 👤 Milton O Schur
- 👤 Robert M Levy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:02
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/12; D21H5/14; D21H5/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
A PROCESS OF PRODUCING CIGARETTE PAPER CONTAINING CELLULOSIC FIBERS AND CALCIUM CARBONATE FILER, COMPRISING INCORPORATING IN REFINED CIGARETTE PAPER PULP A CONTROLLED AMOUNT OF MAGNESIUM CARBONATE IN THE PROPORTION OF ABOUT 11 POUNDS OF MAGNESIUM CARBONATE TO 50 CUBIC METERS OF THE CIGARETTE PAPER PULP STOCK OF ABOUT 2.5% CONSISTENCY, SHEETING THIS CIGARETTE PAPER PULP ON A PAPER MACHINE AND INCORPORATING IN THE WET PAPER SHEET SUFFICIENT AMMONIUM PHOSPHATE TO PROVIDE IN THE FINISHED CIGARETTE PAPER APPROXIMATELY 0.1% TO 1% AMMONIUM PHOSPHATE.
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) | 1957-03-29 | 1957-09-28 | 1958-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-29 | 1961-09-28 | 1962-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-29 | 1965-09-28 | 1966-03-30 | $7700.00 | Window Closed / Lapsed |