US2495043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated product and process of making same
Assignee: United States Gypsum Co
•
Filing: 1943-10-08
•
Granted: 1950-01-17
•
Expires: 1963-10-08
Abstract
No abstract record available.
Inventors
- 👤 Grant S Willey
- 👤 Kenneth S Ruthman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:23
CPC Classifications
B; B27; B27D; B27D1/00; B27D1/04; B32; B32B; B32B27/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31536; Y10T428/31971; Y10T428/31989
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
PROCESS OF PRODUCING LIGNOCELLULOSIC HARDBOARD FROM A PLURALITY OF MATS OF LIGNOCELLULOSIC FIBER WHICH COMPRISES COATING AT LEAST THE CONTACTING SURFACES OF SAID MATS WITH ABOUT 0.450 GRAM OF FERRIC SULFATE PER SQUARE FOOT, DRYING THE THUS COATED MATS, AND PRESSING THEM AT ABOUT 472*F. UNDER A PRESSURE OF ABOUT 1300 POUNDS PER SQUARE INCH FOR ABOUT THREE MINUTES.
Claim 2
Dependent Claim
59 words
PROCESS OF PRODUCING LIGNOCELLULOSIC HARDBOARD FROM A PLURALITY OF MATS OF LIGNOCELLULOSIC FIBER WHICH COMPRISES COATING AT LEAST THE CONTACTING SURFACES OF SAID MATS WITH ABOUT 0.450 GRAM OF FERRIC SULFATE PER SQUARE FOOT, DRYING THE THUS COATED MATS, AND PRESSING THEM AT ABOUT 472*F. UNDER A PRESSURE OF ABOUT 1300 POUNDS PER SQUARE INCH FOR ABOUT THREE MINUTES.
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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) | 1953-01-16 | 1953-07-18 | 1954-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-16 | 1957-07-18 | 1958-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-16 | 1961-07-18 | 1962-01-17 | $7700.00 | Window Closed / Lapsed |