US2760233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making curved sheets from polymerizable material
Assignee: Individual
•
Filing: 1952-10-11
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Granted: 1956-08-28
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Expires: 1972-10-11
Abstract
No abstract record available.
Inventors
- 👤 Bjorksten Johan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:35
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/14; B29C51/02; B29C51/10; Y; Y10; Y10S; Y10S264/00; Y10S264/59; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
THE METHOD OF PRODUCING A CURVED SHEET OF SYNTHETIC RESIN COMPRISING PREPARING A LAYER OF INCOMPLETELY POLYMERIZED PREEPOLYMERIC MATERIAL FLOATING ON THE SURFACE OF A LIQUID HAVING A HIGHER SPECIFIC GRAVITY THAN SAID MATERIAL AND THEN POLYMERIZING SAID MATERIAL AND THEN APPLYING FLUID PRESSURE TO ONE SIDE OF SAID LAYER OF MATERIAL OF GREATER MAGNITUDE THAN THE PRESSURE ON THE OTHER SIDE THEREOF WHEN IT IS IN A STATE OF AT LEAST PARTIAL POLYMERIZATION.
Claim 2
Independent Claim
74 words
THE METHOD OF PRODUCING A CURVED SHEET OF SYNTHETIC RESIN COMPRISING PREPARING A LAYER OF INCOMPLETELY POLYMERIZED PREEPOLYMERIC MATERIAL FLOATING ON THE SURFACE OF A LIQUID HAVING A HIGHER SPECIFIC GRAVITY THAN SAID MATERIAL AND THEN POLYMERIZING SAID MATERIAL AND THEN APPLYING FLUID PRESSURE TO ONE SIDE OF SAID LAYER OF MATERIAL OF GREATER MAGNITUDE THAN THE PRESSURE ON THE OTHER SIDE THEREOF WHEN IT IS IN A STATE OF AT LEAST PARTIAL POLYMERIZATION.
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) | 1959-08-28 | 1960-02-27 | 1960-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-28 | 1964-02-27 | 1964-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-28 | 1968-02-27 | 1968-08-28 | $7700.00 | Window Closed / Lapsed |