US3719544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel adhesive and optical devices laminated therewith
Assignee: Polaroid Corp
•
Filing: 1971-02-01
•
Granted: 1973-03-06
•
Expires: 1991-02-01
Abstract
Abstract Many of the physical problems encountered in the product of an optically perfect lamination between polymethyl methacrylate and cellulose acetate butyrate may be obviated by utilizing an adhesive comprising approximately 95 percent methyl methacrylate monomer, approximately 4 percent nitrocellulose having a viscosity within the range of 600 to 1,000 seconds 1 and about 1 percent of a polymerization initiator for the monomer.
Inventors
- 👤 H Buzzell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:37
CPC Classifications
G; G02; G02B; G02B1/00; B; B29; B29D; B29D11/00; B29D11/0073; C; C09; C09J; C09J4/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31891
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
An optical device comprising a polymethyl methacrylate element and a cellulose acetate butyrate element directly bonded to one another by means of an adhesive composition consisting essentially of approximately 95 percent, by weight, methyl methacrylate monomer, approximately 4 percent, by weight, nitrocellulose having a viscosity of approximately 600 to 1,000 seconds 1 and approximately 1 percent, by weight, of a polymerization initiator for said monomer.
Claim 2
Dependent Claim
65 words
An optical device comprising a polymethyl methacrylate element and a cellulose acetate butyrate element directly bonded to one another by means of an adhesive composition consisting essentially of approximately 95 percent, by weight, methyl methacrylate monomer, approximately 4 percent, by weight, nitrocellulose having a viscosity of approximately 600 to 1,000 seconds 1 and approximately 1 percent, by weight, of a polymerization initiator for said monomer.
References Cited (Backward Citations)
US3208902A
Cited
US3097106A
Cited
US3620888A
Cited
US3597384A
Cited
US3560076A
Cited
US3551027A
Cited
US3597373A
Cited
US3647278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |