Patent US3632278A successfully refreshed from Google Patents.
US3632278A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastomeric shoe sole mold
Assignee: 3M Co
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Filing: 1970-08-27
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Granted: 1972-01-04
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Expires: 1990-08-27
Abstract
Abstract Mold for forming shoe soles in situ which is formed from a single cast elastomeric polyurethane piece having an opening on one side with an inwardly projecting lip encircling the opening to support a shoe upper placed over the mold, liquid polyurethane-forming reaction mixture being cast into the cavity, hardened at a low temperature and then stripped from the mold, encircling lip being sufficiently flexible to permit stripping of shoe from mold without tearing away of sole, said mold preferably having a releasable clamping means such as an encircling band for sealing the mold around a shoe upper and being releasable to facilitate removal of the soled shoe from the mold.
Inventors
- 👤 Myron W Hall
- 👤 Harvey A Chapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:57
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/68; B29C70/74; B29C33/00; B29C33/0038; B29C33/0044; B29C33/38; B29C33/3842; B29C33/3857; B29C33/3878; B29C33/40; B29C33/405; B29C33/44; B29C33/48; B29C33/50; B29C39/00; B29K; B29K2875/00; B29K2995/00; B29K2995/0037; B29K2995/0046; B29L; B29L2031/00; B29L2031/48; B29L2031/50; B29L2031/504; Y; Y10; Y10S; Y10S425/00; Y10S425/019; Y10S425/044; Y10S425/058
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
82 words
A mold according to claim 1 wherein said matrix is in the shape of an oval which has its ends removed, said ends being replaced by rigid incompressible elements having a shape corresponding to the removed ends, said clamping means completely encircling said mold, said clamping means being contractable to radially inwardly compress the sides of said mold into sealing relationship around said shoe upper and expandable for removal of a soled shoe and positioning of another shoe upper over said opening.
Claim 2
Dependent Claim
24 words
A mold according to claim 2 wherein said clamping means is a metal band having a toggle clamp therein for shortening and lengthening thereof.
Claim 3
Dependent Claim
178 words
A mold for casting shoe soles in situ on lasted shoe uppers comprising, in combination: an elastomeric polyurethane matrix having a cavity open on one side for receiving said shoe upper, said cavity conforming to the shape of a shoe sole corresponding to said shoe upper, said matrix having an inwardly projecting lip encircling the perimeter of said cavity adapted to support said shoe upper on said matrix and to form a top surface of said sole, said lip being deformable to permit stripping of successive soled shoes from the matrix, said matrix further having an arcuate, smooth-surfaced outer perimeter such that it may be encircled and radially compressed around said shoe upper by a clamping means, said matrix having an opening for charging sole forming material into said cavity, and an expandable, contractable clamping means encircling said outer perimeter, said clamping means being expandable for positioning said shoe upper into said cavity and contractable after insertion of said shoe upper into said opening, whereby said matrix is radially compressed into a sealing relationship around said shoe upper.
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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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |