US2668111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper making processes
Assignee: Certainteed LLC
•
Filing: 1952-03-05
•
Granted: 1954-02-02
•
Expires: 1972-03-05
Abstract
No abstract record available.
Inventors
- 👤 John R Lindquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:07
CPC Classifications
C; C08; C08C; C08C1/00; C08C1/14; C08C1/15; D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
IN A PAPER MAKING PROCESS WHEREIN AN EMULSION IS ADDED TO THE FURNISH AND SUBSEQUENTLY COAGULATED ON THE INDIVIDUAL FIBERS COMPRISING THE FURNISH, THE IMPROVED METHOD COMPRISING, COAGULATING THE EMULSION WITH GUANIDINE FORMALDEHYDE.
Claim 2
Dependent Claim
33 words
IN A PAPER MAKING PROCESS WHEREIN AN EMULSION IS ADDED TO THE FURNISH AND SUBSEQUENTLY COAGULATED ON THE INDIVIDUAL FIBERS COMPRISING THE FURNISH, THE IMPROVED METHOD COMPRISING, COAGULATING THE EMULSION WITH GUANIDINE FORMALDEHYDE.
References Cited (Backward Citations)
US1621399A
Cited
US2607750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |