Patent US2928131A successfully refreshed from Google Patents.
US2928131A
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Light diffusing means and method of making same
Assignee: American Optical Corp
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Filing: 1957-04-23
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Granted: 1960-03-15
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Expires: 1977-04-23
Abstract
No abstract record available.
Inventors
- 👤 Mahler Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:31
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/02; G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625; C08J2329/00; C08J2329/02; C08J2329/04; Y; Y10; Y10S; Y10S264/00; Y10S264/71; Y10S359/00; Y10S359/90; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24479
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
83 words
THE METHOD OF MAKING LIGHT-DIFFUSING MEANS COMPRISING IMMERSING A FILM OF POLYVINLY ALCHOL IN A SOLUTION OF BORIC ACID AND WATER FOR A TIME SUFFICIENT TO RENDER THE FILM ELASTIC, SUBJECTING SAID FILM TO A STRETCHING FORCE OF A CONTROLLED AMOUNT, REMOVING THE FILM FROM SAID SOLUTION WHILE RETAINING SAID FORCE ON SAID FILM ALLOWING SAID FILM TO DRY AT ROOM TEMPERATURE AND THERAFTER HEATING THE FILM ABOVE ROOM TEMPERATURE WHILE RELEASING SAID FORCE BY AN AMOUNT SUFFICIENT TO PERMIT A RELATIVELY RAPID
Claim 2
Independent Claim
83 words
THE METHOD OF MAKING LIGHT-DIFFUSING MEANS COMPRISING IMMERSING A FILM OF POLYVINLY ALCHOL IN A SOLUTION OF BORIC ACID AND WATER FOR A TIME SUFFICIENT TO RENDER THE FILM ELASTIC, SUBJECTING SAID FILM TO A STRETCHING FORCE OF A CONTROLLED AMOUNT, REMOVING THE FILM FROM SAID SOLUTION WHILE RETAINING SAID FORCE ON SAID FILM ALLOWING SAID FILM TO DRY AT ROOM TEMPERATURE AND THERAFTER HEATING THE FILM ABOVE ROOM TEMPERATURE WHILE RELEASING SAID FORCE BY AN AMOUNT SUFFICIENT TO PERMIT A RELATIVELY RAPID
Claim 3
Dependent Claim
11 words
LIGHT-DIFFUSING SHEET MATERIAL PRODUCED BY THE METHOD DEFINED IN CLAIM 1.
References Cited (Backward Citations)
US1885208A
Cited
US1983626A
Cited
US2232551A
Cited
US2248638A
Cited
US2360650A
Cited
US2321635A
Cited
US2421624A
Cited
US2373215A
Cited
US2509279A
Cited
US2445579A
Cited
US2510344A
Cited
US2445555A
Cited
US2508058A
Cited
US2547736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |