US3284969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prefabricated igloo
Assignee: Individual
•
Filing: 1963-11-27
•
Granted: 1966-11-15
•
Expires: 1983-11-27
Abstract
No abstract record available.
Inventors
- 👤 Walters John William
- 👤 Dorothy D Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:22
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/32; E04B1/3211; E04B2001/327; E04B2001/3276
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A PREFABRICATED SHELTER COMPRISING A PLURALITY OF ARCUATELY CURVED SHEET-LIKE RIGID WALL SEGMENTS HAVING TOP PORTIONS IN THE FORM OF SPHERICAL SEGMENTS, SAID WALL SEGMENTS HAVING REDUCED SIDE MARGINAL EDGE PORTIONS INTERFITTING IN OVERLAPPING RELATIONSHIP ALONG THEIR LENGTH, SAID EDGE PORTIONS OF THE TOP PORTIONS ONVERGING TOWARDS A COMMON VERTEX, MEANS FASTENING SAID SIDE MARGINAL EDGE PORTIONS TOGETHER IN OVERLAPPING RELATIONSHIP, A COVER CAP OVERLYING THE COMMON VERTEX AND HAVING A STEM PORTION DEPENDING THROUGH SAID VERTEX, A WASHER ON SAID STEM PORTION UNDERLYING THE CONVERGENT TOP PORTIONS OF THE WALL SEGMENTS, A CLAMPING NUT ON THE STEM PORTION BELOW AND BEARING AGAINST SAID WASHER, ONE OF THE WALL SEGMENTS BEING FORMED WITH A DOORWAY, A PAIR OF RIGID TUNNEL SEGMENTS HAVING INTERFITTING OVERLAPPING TOP MARGINAL PORTIONS, AND MEANS SECURING SAID TOP MARGINAL PORTIONS TOGETHER IN OVERLAPPING RELATIONSHIP TO DEFINE A TUNNEL STRUCTURE, SAID TUNNEL STRUCTURE FITTING SLIDABLY IN SAID DOORWAY, SAID WALL SEGMENTS AND TUNNEL SEGMENTS BEING FORMED OF RIGID MOULDED PLASTIC FOAM MATERIAL.
Claim 2
Dependent Claim
165 words
A PREFABRICATED SHELTER COMPRISING A PLURALITY OF ARCUATELY CURVED SHEET-LIKE RIGID WALL SEGMENTS HAVING TOP PORTIONS IN THE FORM OF SPHERICAL SEGMENTS, SAID WALL SEGMENTS HAVING REDUCED SIDE MARGINAL EDGE PORTIONS INTERFITTING IN OVERLAPPING RELATIONSHIP ALONG THEIR LENGTH, SAID EDGE PORTIONS OF THE TOP PORTIONS ONVERGING TOWARDS A COMMON VERTEX, MEANS FASTENING SAID SIDE MARGINAL EDGE PORTIONS TOGETHER IN OVERLAPPING RELATIONSHIP, A COVER CAP OVERLYING THE COMMON VERTEX AND HAVING A STEM PORTION DEPENDING THROUGH SAID VERTEX, A WASHER ON SAID STEM PORTION UNDERLYING THE CONVERGENT TOP PORTIONS OF THE WALL SEGMENTS, A CLAMPING NUT ON THE STEM PORTION BELOW AND BEARING AGAINST SAID WASHER, ONE OF THE WALL SEGMENTS BEING FORMED WITH A DOORWAY, A PAIR OF RIGID TUNNEL SEGMENTS HAVING INTERFITTING OVERLAPPING TOP MARGINAL PORTIONS, AND MEANS SECURING SAID TOP MARGINAL PORTIONS TOGETHER IN OVERLAPPING RELATIONSHIP TO DEFINE A TUNNEL STRUCTURE, SAID TUNNEL STRUCTURE FITTING SLIDABLY IN SAID DOORWAY, SAID WALL SEGMENTS AND TUNNEL SEGMENTS BEING FORMED OF RIGID MOULDED PLASTIC FOAM MATERIAL.
References Cited (Backward Citations)
US791149A
Cited
US1070474A
Cited
FR772898A
Cited
US2278956A
Cited
US2293569A
Cited
DE880060C
Cited
US2376695A
Cited
US2453326A
Cited
US2820990A
Cited
US2958918A
Cited
US2982290A
Cited
US2944370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |