US4221083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat shield blocking and mounting disc for lens grinding
Assignee: Valley Industrial Products
•
Filing: 1978-01-03
•
Granted: 1980-09-09
•
Expires: 1998-01-03
Abstract
Abstract A heat shield and blocking disc for use in lens grinding which comprises a carrier layer of flexible optical transparent plastic having transparent adhesive coatings on both sides thereof, one of which is adapted to stick to a plastic lens blank but to be stripped therefrom with a minimum of residue with the other adhesive compatible with the normal alloy used in blocking glass lens blanks, permitting a simpler blocking of plastic lenses and the use of the normal alloy, thereby reducing the cost of the process.
Inventors
- 👤 Thomas J. Carroll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:57
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/005; B24B13/0057; C; C09; C09J; C09J7/00; C09J7/20; C09J7/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
A method of making a lens from a lens blank comprising: (a) mounting a transparent flexible plastic mounting disc and heat shield having transparent adhesive on both sides thereof onto the lens blank; (b) placing said lens blank with said plastic disc thereon on a lens block with a space therebetween; (c) attaching said lens blank with said disc thereon to said lens block by supplying an alloy to the space therebetween; (d) carrying out grinding, fining and polishing operations on said lens block to form the lens; and (e) deblocking said lens.
Claim 2
Independent Claim
93 words
A method of making a lens from a lens blank comprising: (a) mounting a transparent flexible plastic mounting disc and heat shield having transparent adhesive on both sides thereof onto the lens blank; (b) placing said lens blank with said plastic disc thereon on a lens block with a space therebetween; (c) attaching said lens blank with said disc thereon to said lens block by supplying an alloy to the space therebetween; (d) carrying out grinding, fining and polishing operations on said lens block to form the lens; and (e) deblocking said lens.
Claim 3
Dependent Claim
53 words
The method according to claim 1 wherein said step of deblocking comprises: (a) placing said lens, plastic disc and lens block into a heated bath; (b) once the alloy has melted, removing said lens with said disc attached thereto from said bath; and (c) stripping said flexible plastic mounting disc from said lens.
Claim 4
Dependent Claim
26 words
The method according to claim 2 wherein said step of de-blocking comprises shocking-off said lens and then stripping said flexible plastic mounting disc from said lens.
Claim 5
Dependent Claim
63 words
The method according to claim 1, wherein said transparent flexible mounting disc is made of a vinyl plastic, said adhesive on the side contacting said lens is an adhesive which is of a type which can be cleanly stripped from a plastic lens and said adhesive on the other side of said disc is an adhesive which will bond to a blocking alloy.
References Cited (Backward Citations)
US2607711A
Cited
US3197326A
Cited
US3490182A
Cited
US3404488A
Cited
US3925271A
Cited
US3962833A
Cited
US3996701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |